Evolution

The evolutionary history of a species is often displayed in a phylogenetic tree. This will clearly show the history of the species, which is also known as phylogeny.

he was different because lamarck was using already true things to prove something and wallace was a theorist

Evolution Evolution is the gradual change in the genetic composition of a population during successive generations, and over time, even millions of years.

Evolution does not necessarily have to be a closed, solitary theory - one can believe in god and evolution, or different takes on creationism, or evolution in the realms of intelligent design.

You can choose to accept microevolution or macroevolution.

You can choose to believe that God is behind any and all changes or, you can look at the data on the origins of the world and decide to take a completely fact-driven approach based on existing records void of any spirituality - that's cool too. You can accept each theory independently or in various combinations.

One key point remains. There is so much evidence that most scientists no longer feel the need to defend the theory of evolution. To decide for yourself if evolution is "true," begin reviewing the evidence that supports the theory, and educate yourself about the subject.

After all, the existence of God is much harder to prove than the theory of evolution, which is based on science. Just looking at evolution through the eyes of a scientist, evolution appears to be correct.

Evolution is NOT abiogenesis or the big bang theory. The theory of evolution explains how organisms change and become more complex and diverse. It explains the creation of a separate species, not the origin of life or the universe.

Stabilizing selection.

Evolutionary theory actually has little to say about the origin of life, other than that the first lifeforms were likely to be much simpler than modern organisms.

The field of research that addresses questions related to the origin of life is abiogenesis research, a branch in the discipline of biochemistry.

As yet, there are no specific favoured comprehensive models regarding the origin of life, and no evidence to distinguish between the many hypothetical models that have been formulated.

book bed

Evolutionist .

A population.

They probably have a recent common ancestor

The theory of evolution is relevant to every aspect of the science of biology. It shows relationships between different aspects of biology which otherwise would not seem to be related. Thus, it unifies the science of biology.

Insects first came on land around 400 million years ago. They evolved from aquatic arthropods, specifically from a group of crustaceans known as branchiopods. This transition allowed insects to thrive in various terrestrial environments and eventually become one of the most diverse groups of animals on Earth.

One major trend in animal evolution has been the gradual increase in the ratio of brain size to body mass. Birds of the late Cenozoic have larger ratios than cretaceous avians. This same general principle holds true for mammals, of course. I'm not so certain the relation carries over to reptiles (diapsids), turtles (anapsids), or fish.

Of course, there are cephalopods, insects, and hoary hosts of other animals. I'm not as familiar with evolutionary trends in marine species.

Darwin didn't have a catchphrase for this, as far as I am aware. A famous catchphrase for natural selection that was coined by Herbert Spencer and used by Charles Darwin is "survival of the fittest". Unfortunately this catchphrase does a rather poor job of portraying the principle of differential reproductive success.

Bacteria, like all organisms, have phenotypic variations. Some bacteria are resistant to antibacterial drugs and survive the onslaught of these drugs. They then go on to have progeny ( by fission ) that they confer this resistance on so that you have a new population of resistant bacteria.

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Convergent evolution is when various species evolve similar solutions to similar evolutionary pressures, independently and often at different times in the earth's history. A good example is the Ichsyosaurous(swimming dinosaur), sharks, and dolphins. All of them evolved with a very similar torpedo shaped body. Another example is the eyes of octopi and humans. They are alike in structure and function.

The rare Tasmanian Beech tree is the only true deciduous tree in Australia, and was long thought to be a relative of the northern hemisphere species, but study of its DNA shows that its origions date back to the Gondwana-southern supercontinent. So, the leaf shedding strategy evolved seperately in both hemispheres, another example of convergent evolution.

Spontanous genetic mutations occur, some are helpful and the animal and it's offspring survive, and some are harmful and they don't. That is how genetic variations are selected (ie evolution).

Those variations are useful or not useful based on whether they increase or decrease an organism's chance of survival or reproduction.

A change in DNA that gives a survival advantage to a particular genotype under particluar environmental conditions. :)

2H2O2 --> 2H2O + O2


Catalyzing this reaction. The breakdown of hydrogen peroxide into water and oxygen gas.

His first paper was titled:-

'On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection'

His book was titled

'On the Origin of Species by Means of Natural Selection, or The Preservation of Favoured Races in the Struggle for Life' (usually abbreviated to On the Origin of Species).

In these publications he set described things/features that could be seen in the biological world and presented a process by which these could arise over time, with evidence to support these proposals. As such his publications conform to the scientific method and may be called a theory.

His proposals are now well accepted as being a correct/true description about how the variety of life as we know it came to be on our planet and form the basis of modern evolutionary theory. *In scientific terminology, a theory is a proposal/explanation with evidence that could be defended (a fossil record, the different bird specie variations, etc.) and an idea that can be used to predict further developments; in this case, that there have been/are/will be major changes to an organism's DNA/RNA over time as it adapts to its environment, which can be proven with a decent microscope and some bacteria, and common acceptance in the scientific community (tick this box).

Because natural selection only preserves incremental beneficial traits to the organism and many different areas of the organism are undergoing mutation and natural selection at the same time against the backdrop of the immediate environment. If a population of organisms, subject to allele change due to natural selection, is not in a changing environment, or split in a allopatric event, then adaptive change will be very slow, or will not happen at all and selection will winnow those variants and stabilizing selection is taking place. Regression to the mean of phenotype.

Main points of Lamarck's theory are the following . 1 Changing environment produced need for new organs . 2 there is an increase in size of organs and organisms . 3 use and dis use of organisms . Inheritance of acquired characters .

In every way.

David Suzuki is well known for saving energy, and trying to help our environment. He writes speeches, and stories for both adult and children. He is a wonderful man who is trying to save our world.