Evolution

Scientists use similarities in early development among different species to support evolution by showing that closely related species share common ancestry. These similarities reflect patterns of shared genetic information inherited from a common ancestor, providing evidence for evolutionary relationships. Comparing early development across species helps to decipher evolutionary history and understand how different organisms have evolved over time.

This method is called propagation. It involves growing new plants from a part of an existing plant, such as a cutting, in this case from a shrub's branch.

if new evidence doesn't support a scientific theory, scientists will either revise the theory to accommodate the new evidence or discard the theory altogether in favor of a more accurate explanation. This process is crucial for the progress of science as it ensures that theories are continuously tested and refined to reflect our understanding of the natural world.

The first plants are believed to have evolved from aquatic algae in the water around 450 million years ago. These early plants eventually adapted to living on land, with evidence suggesting the first land plants emerged around 425 million years ago.

Protista is a kingdom within the eukaryotic domain. However, the kingdom is recognized to be paraphyletic: it is not defined as an ancestor and all its descendants, but includes a wide variety of organisms of which the exact relationship to the eukaryotic domain is not determined. Genetic assays are now being applied to redefine the various clades in Protista and establish their relationships.

Pros of evolution include the diversity and adaptability of species, driving the natural selection process. Cons may include the potential for extinction of species that are not able to adapt quickly enough to changes in their environment.

Darwin's finches were the result of adaptive radiation. One species coming to the Galapagos Islands radiated throughout all the Islands becoming many species fulling many different niches. Another example is the demise of the dinosaurs. Mammals radiated out from small, general beginnings to fill all the niches left by the extinct dinosaurs.

hi

In vitro we must converted the RNA to cDNA to diagnosis viral RNA in PCR.

In vivo RNa viral infected the cell RNA converted to cDNA IN SIDE THE CELL BY REVERSE TRANSCRIPTASE therfore cDNA insertion in the DNA of cell infected

thank you

hi

In vitro we must converted the RNA to cDNA to diagnosis viral RNA in PCR.

In vivo RNa viral infected the cell RNA converted to cDNA IN SIDE THE CELL BY REVERSE TRANSCRIPTASE therfore cDNA insertion in the DNA of cell infected

thank you

Lamarck believed that there was a form of evolution, but contrary to Darwin after him, he believed that the characteristics an organism acquires during his life are inherited by its descendants.

For more on Lamarck's hypothesis, see the related question below.

Lack of enough free oxygen in the atmosphere and oceans. The ability for cells to utilise oxygen was the breakthrough for eukaryotes. Before this time there wasn't enough free oxygen, but this period was the start of an accelerated diversification for single celled organisms.

Barbellus evolution refers to the study of how the genus Barbellus, which includes freshwater fish from the family Cyprinidae, has changed over time through processes like natural selection, genetic drift, and adaptation to new environments. By examining the genetic and morphological changes in different species of Barbellus, researchers can piece together its evolutionary history and understand how it has diversified and evolved in response to various ecological pressures.

Yes, evolution is a theory. But it is not "just a theory" in the sense that you probably mean. In layman's terms, we might speak of a theory as simply an idea or an opinion, such as "Well, that's YOUR theory..." In science, it is something else entirely, and when something becomes scientific theory, it has been very well substantiated. It is more synonymous with the word "fact" in this usage, unlike the previous usage I used as an example. in fact, all scientific discoveries are considered theories. hell, the fact that our bodies are made up of cells that reproduce is still just a theory.

Well, in terms of most deaths per year: -Mycobacterium Tuberculosis, the bacterium that causes the disease Tuberculosis, kills more people a year than any other bacteria (about 1.5 million deaths a year). -Plasmodium, a genus of protozoan parasites (the deadliest species being Plasmodium Falciparum) that causes the disease Malaria, kills more people a year than any other parasite (about 2 million deaths a year). -Human Immunodeficiency Virus (HIV), the virus that causes the disease Acquired Immunodeficiency Syndrome (AIDS), kills more people than any other virus (about 2 million deaths a year). In terms of highest fatality rate, then I don't know. However, I do know that an infection by the Zaïre virus (a type of Ebola virus) has a fatality rate of over 80%. That's less than one case out of five that survives. It's also of note that if Tuberculosis and Malaria are addressed immediately and receive proper medical attention, they can be treated so that the disease does not accelerate death. Most Malaria-caused deaths are in children under 8 years old that do not receive medical attention. AIDS treatment, however, only delays death. Treatment can keep victims alive for decades (though most victims die much sooner), though eventually the virus will overcome.

It would be intraspecific competition if this paramecium were alone in the culture; competing for limited resources. Interspecific if some other species were in the culture. Answer C is totally out, as competition and cooperation are not dichotomies, but exist in real situations same species or not.

Three basic components of today's theory of evolution are genetic variation within a population, natural selection acting on this variation, and the inheritance of traits that confer a survival or reproductive advantage.

The filamentous morphology of water molds is considered a case of convergent evolution with the hyphae of fungi because they both have evolved similar structures independently to increase their surface area for nutrient absorption and growth. Despite the similarities in appearance, water molds and fungi are not closely related but have evolved analogous structures through natural selection to better adapt to their respective environments.

The environmental challenge in the Grants' study was a severe drought that occurred in 1977 on the Galápagos Islands where they were studying finches. This drought caused a shortage of food, particularly the small seeds that the finches relied on for survival.

This is because closely related species share a more recent common ancestor, leading to a more recent divergence in their DNA sequences. As species diverge over time, accumulation of genetic mutations cause differences in their DNA. Therefore, closely related species have had less time for genetic mutations to accumulate, resulting in more similar DNA sequences for certain proteins like cytochrome.

In 1858 Alfred Russel Wallace published the theory of evolution, which he had concieved many years ago. One year later, Darwin published the same theory. Unlike Darwin, Wallace began his career as a travelling naturalist already believing in the transmutation of species.

Yes, a cDNA library contains only exons because it is generated from mRNA, which has had introns removed through the process of splicing. cDNA represents the expressed regions of the genome and does not contain non-coding introns found in genomic DNA.

Life is believed to have originated on Earth around 4 billion years ago, shortly after the planet's formation. The exact timing is still debated among scientists, but the earliest evidence of life dates back to around 3.5 billion years ago in the form of microbial fossils.

Neutral mutations do not have a significant impact on biodiversity because they do not affect an organism's ability to survive and reproduce. Biodiversity is mainly influenced by mutations that provide a fitness advantage or disadvantage, leading to changes in the frequency of different traits within a population. Neutral mutations simply accumulate over time without impacting biodiversity directly.

There are no holes in evolution. Evolution is a scientific theory -- which is the strongest and most certain classification - it means that it's been proven and withstood countless years of challenges. A scientific theory is not like a casual theory, it's not a guess, it's not hypothesis. A scientific theory is a model that explains observed phenomena. A scientific theory must make predictions that can be tested and all those predictions and every test must have been successfully verified.

A scientific theory also has to have a method by which it can be disproved (like finding a human fossil in the pre-cambrian).

Some people claim that evolution has holes because there are "missing links", but it's unlikely that scientists will find the fossils of absolutely each and every species which has ever existed. Paleontologists have found far more than enough fossils in precisely the predicted "order" to validate the theory. Each time a new fossil-species is found, then two new "gaps" are created to each side.

Some people claim that there are no transitional fossils. Technically, every species is transitional. Paleontologists have found thousands of different species which are "between" other known species.

Scientists have even predicted where and "when" other expected transitional species should be found, and that has provided researchers with Tiktaalik.

If any defects were found with evolution, the model would lose it's "theory" status. There are countless people with vested interests in overturning evolution, but to date, none have come up with a single provable or verifiable or testable challege. And they'd absolutely win centuries of fame and the Nobel prize.

Genome mapping itself is hardly controversial. It's the applications of genome mapping that may, depending on the way its applied, generate controversy. For instance, some people may want to use genome mapping to preselect human embryos for fertilization, thereby gaining control over the physical characteristics of their future children - while other people are repelled by the notion and argue that nature should take its course.