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Evolution

The scientific theory according to which populations change gradually through a process of natural selection.

5,264 Questions

Why do vertebrates share a common ancestor?

Vertebrates is the name of a taxon, a clade in biology. The most important defining characteristic of this group is that they all have vertebrae.

Within this group are many subgroups, which have slightly different characteristics, but all share the defining characteristics of the larger group (the vertebrates).

The group vertebrates itself is a subgroup of a larger group. Together with a couple of other groups, it is part of the group Chordata. The most important defining characteristic of this group is that the animals in it all have a central nerve chord along the length of their bodies. Vertebrates and all its sister-groups share this trait, and all the other traits of the larger group, but differ in others (eg. not all chordates have vertebrates).

It is this pattern of nested hierarchies, sets within sets within sets, each set sharing the defining characteristics of the superset, but differing in others, that made naturalists conclude that the diversity of life is the product of a process of continuous divergence: evolution. In this model, a superset (ancestral form) produces lineages (subsets) with diverging characteristics. Each of the diverging lineages keeps many of the characteristics of the ancestor, but becomes increasingly different from the ancestral form and its sibling lineages in other aspects. It is this pattern that tells us that all vertebrates have a common ancestor that was part of the clade of Chordata.

What are the theories of human evolution?

Some theories of human evolution include the Out of Africa theory, which suggests that modern humans evolved in Africa and migrated to other parts of the world. The Multiregional theory suggests that modern humans evolved simultaneously in different regions of the world. The Recent African Origin theory posits that modern humans originated in Africa and replaced other hominid populations.

What are the 4 main theories of evolution?

The four main theories of evolution are natural selection, genetic drift, gene flow, and mutations. Natural selection is the process by which beneficial traits become more common in a population. Genetic drift is the random fluctuation of allele frequencies in a population. Gene flow refers to the transfer of genes between populations. Mutations are the source of new genetic variation in a population.

How did the theory of evolution help society?

It helped us to understand how the world came to be and how we arrived in the world.

The largest group into which an organism can be classified?

According to taxonomic hierarchies (taxa), the major classification group is called "superkingdom", followed by "kingdom", "suprakingdom" and "domains". Superkingdom is a taxa with only use for a better classification, not a natural classification, it makes it easier to group organisms.

The largets group is superkingdom Prokarya, the one concerned with bacterias, followed by kingdom fungi.

What is theory of structuralism?

Structuralism is a theoretical approach that looks at the underlying structures that shape human experiences, such as language, culture, and society. It focuses on the relationships between elements within these structures rather than individual elements themselves. Structuralism was influential in fields like anthropology, linguistics, and literary theory in the 20th century.

What are the examples of annelids?

Examples of annelids include earthworms, leeches, and marine worms. These segmented worms typically have a cylindrical body and can be found in various habitats, such as soil, freshwater, and marine environments.

What are the three classes of annelids?

The three classes of annelids are Polychaeta (marine worms with bristle-like structures called chaetae), Oligochaeta (terrestrial and freshwater worms like earthworms), and Hirudinea (leeches, which are typically found in freshwater environments).

Examples of Annelids?

earthworms, polychaete worms, and leeches, rag-worms and phylum nematoda hope i helped :D

Is a sponge alive?

No, a sponge is not considered alive in the biological sense because it lacks organs, tissues, and a nervous system. Sponges are simple multicellular organisms that rely on filtering water to obtain nutrients and oxygen.

Is a sponge an organism?

No, a sponge is not considered an organism in the traditional sense because it lacks complex organ systems and does not exhibit characteristics of living organisms like movement or the ability to consume nutrients. Sponges are classified as multicellular filter feeders belonging to the animal kingdom.

What are the theories of discourse?

The theories of discourse involve man loving and reducing the population
The word discourse can be used as a verb or a noun. As a verb, it means to write or speak about a topic authoritatively. A synonym is the word pontificate.

Compare early and contemporary theories of intelligence?

Early theories of intelligence, such as Spearman's g-factor theory, focused on a single general intelligence factor. Contemporary theories, like Gardner's theory of multiple intelligences, propose that intelligence is composed of various abilities across different domains. While early theories emphasized cognitive abilities, contemporary views consider emotional, social, and practical intelligence as essential components of intelligence.

What does the peking man reveal?

Peking Man refers to a collection of fossils belonging to Homo erectus found near Beijing, China. The discovery of Peking Man has provided crucial insights into human evolution and prehistoric life, shedding light on early human behavior, anatomy, and tool use. These fossils have significantly contributed to our understanding of the origins and development of our species.

What is the current theory of evolution?

That is a very hard question to answer as the "Theory of Evolution" is really an umbrella term for several theories based on the fact that allele frequencies of populations change over time, and the assumption that they have done so for the entirety of life on earth, as well as continuing on into the future.

Evolution does NOT claim that there is no God. It makes NO STATEMENT whatsoever about spiritual matters. In fact, statistically speaking, the majority of the people who accept evolution are christians. It also does NOT include big-bang cosmology, does not require a multi-billion year-old earth, and does NOT address the origin of life at all, only its' variety.

Current evolutionary theory can be traced to the moment when Darwin proposed his theory on the mechanics of evolution which overturned the previously held view proposed by LaMarck.

LaMarcks theory of evolution proposed that an animal gains a trait in its' lifetime and then passes it on.

Darwins theory replaced LaMarcks theory by proposing that changes were inherited, but not acquired during the lifetime of the individual. He attributed these changes to random mutations present from birth.

Darwin did not stop with a mechanism for these changes, he also divised the "theory of Natural Selection" as a mechanism to favor beneficial mutations.

Later, he proposed his "theory of Common Descent" as an explanation of the current variety we see in life. This theory proposes that at some point in the distant past, all living things share a common ancestor.

Darwins three ideas have been confirmed through genetics, phylogenics, taxonomy, and paleontology, as well as being supported by every branch of science which can address biology.

Through more discoveries, other scientists have developed even more specific theories based on evolution such as, "punctuated equilibrium", "evo-devo", and even the "Out of Africa" theory of human origins.

The more we understand about the history of life, the more theories will be developed, but they are all part of evolutionary theory.

What is the evolution of the human?

Interesting question but too tough to answer.

There are a lot of things that affect how we act and if we knew what they were we could control ourselves, right?

I also think there are a lot of new things that affect human nature (its not just beer and coffee anymore), so it is even more difficult.

But I somehow feel you are asking a retorical question.

How do vestigial structures provide evidence that we evolved from organisms that existed in the past?

Vestigial structures are anatomical features that have lost their original function in an organism but are still present. These structures often have similarities to functional structures in related organisms, suggesting a shared evolutionary history. By studying these vestigial structures, scientists can infer how organisms have changed over time through the process of evolution.

Why was the development of bidedalism a very important event in the evolution of hominid?

The development of bipedalism allowed hominids to free their hands for carrying objects and using tools, enabling a more efficient way of gathering and transporting resources. It also opened up new possibilities for long-distance travel and hunting strategies, contributing to the success and adaptability of early hominids in diverse environments. Bipedalism also played a role in shaping the anatomy and cognitive abilities of hominids, leading to further advancements in their evolution.

Did we evolve from animals?

Humans are directly descended from prehistoric apes, but it can be argued that, yes, we are in fact descendants of a group of fish that began crawling on land around 400 million years ago. In fact, all animals with four limbs today (including us) are share a common ancestor found in a group of fish that had four strong bony fins. These fish also had lungs, and their fins helped hoist them out of the water, usually to travel from one pool to another, or to breath air when oxygen was scarce in the water.

Some of these fish became more and more adapted to spending time on land, and so groups branched out including the amphibians and reptiles. After millions of years, one group of reptiles became warm-blooded and started growing hair. They evolved into the mammals, and as you may know humans are mammals.

How do we know all this? There are a lot of fossils from different rock layers which give us clues into how life developed over many millions of years.

Actually, every single organism on Earth, from the smallest bacteria to the largest mammals are all related to one another in some way through a common ancestor that first appeared billions of years ago. All life branched out from that one microscopic organism that lived in the ocean so long ago. All life is connected into one giant evolutionary tree, with little branches which eventually lead to one trunk: our last common ancestor.

Why is understanding evolution especially important today now that people can travel easily?

Understanding evolution is crucial today because the ease of travel facilitates the spread of diseases, making it important to comprehend how pathogens evolve and adapt. Additionally, with increased global movements, it is essential to appreciate how species can adapt to new environments and potentially become invasive. Understanding evolution also helps in addressing issues like climate change and antibiotic resistance.

What are subdiciplines used to understand human evolution?

Subdisciplines used to understand human evolution include paleoanthropology, genetics, archaeology, paleontology, and primatology. Each of these fields provides unique insights into the origins and development of humans through the study of fossil evidence, genetic analysis, ancient artifacts, and the behavior of closely-related species.

Does evolution on describe behavior?

Evolution can influence behavior by shaping traits that increase an organism's chances of survival and reproduction. For example, behaviors such as parental care, cooperation, or aggression may be the result of evolution in response to specific environmental pressures. Ultimately, behavior can be seen as an adaptive response to evolutionary processes.

What is the science behind franz boas?

Founder of American cultural anthropology and not a pure empiricist himself. His followers, such as Margret Mead, took cultural anthropology into the realm of the incoherent and empirically unsupported.

What should be the science behind cultural anthropology is the theory of evolution by natural selection, but cultural anthropology has actual stated, generally, that it wishes to leave science behind.

What are the periods in the evolution of English language?

There are three periods in the evolution of the English language.

Old English was the first. This began the the fifth century AD and evolved out of Germanic languages. Beowulf was written in Old English.

Next is Middle English. This began in 1066 AD with the Norman invasion. The invasion brought with it the influence of French. Chaucer wrote in Middle English.

Then came the "Great Vowel Shift" of the sixteenth century AD. This began the era of Modern English.