What does evolution mean and how does it happen?

Answer 1

Evolution is the gradual change in a species' genetic make-up that allows it to adapt to its surroundings better than others. Individuals with this beneficial mutation will have a better chance of surviving to pass on their genes. This is known as "survival of the fittest".

Evolution happens when there is a genetic mutation. We get 50% of our genetic characteristics from each parent. These then combine during meiosis but with some alteration. This changes how the genes are expressed.

Consider the giraffe. They are tall because they have adapted to feed on leaf shoots high in the canopy. Their antecedents would not have been so tall but perhaps one individual was born slightly taller than its peers. He would have been able to feed better and grown more robust. attracting a good mate. His progeny would have inherited this "taller" gene. Eventually, there would have been more "tall" proto-giraffes than short ones who would not have been able to compete for food. The short ones would die off.

Evolution is about small changes over millions of years. Proof for evolution can be found in the fossil record and in comparative embryology. For example, dolphin foetuses grow limbs that vanish after a few months development. This tells us they once were land mammals.

Answer 2

Evolution is change in the nature of organisms - plants and
animals over time, with the 'design' changes only being
possible for new offspring.
The theory is that the structure of organisms
is defined by genetic code. Offspring are usually produced
by varying the genes in the new offspring according to some
biological mechanism and also combination between parents'
candidate genes. Changes can also occur due to random
damages to the genetic code due to environmental radiation
from the Sun etc (or God if He wanted).
The the new offspring is 'fit' in terms of the environmental demands it can handle well, so that it will live long and produce its own offspring. So generally, the optimal survival strategies and biological structures will tend to increase.

Answer 3

What is evolution?

Biological evolution refers to the cumulative changes that occur in a population over time. These changes are produced at the genetic level as organisms' genes mutate and/or recombine in different ways during reproduction and are passed on to future generations. Sometimes, individuals inherit new characteristics that give them a survival and reproductive advantage in their local environments; these characteristics tend to increase in frequency in the population, while those that are disadvantageous decrease in frequency. This process of differential survival and reproduction is known as natural selection. Non-genetic changes that occur during an organism's life span, such as increases in muscle mass due to exercise and diet, cannot be passed on to the next generation and are not examples of evolution.
i have no idea what any of that means

Answer 4

Evolution is a theory that explains the various differences in organisms. The idea of it is that advantageous mutations in a certain organism allow it to adapt to it's environment better,increasing it's chance to mate, and pass on it's special mutation.

Answer 5

evolution is the gradual change over a long period of time.
it happens by random gene mutations which helps the organism survive, and reproduce and is passed on to its offspring

Answer 6

It means that you were a monkey 4billion years ago,but now you're hair-free.Now you're known as a new species THE HUMAN.
There is no scientific proof of evolution,but scientists try to tell you that there is something like that.
But the proof is in the pudding

Answer 7

Evolution is the change in plants, animals, etc. due to natural selection.
Go to http://darwin-online.org.uk for extensive details.

Answer 8

Read the origin of species by Darwin!

Answer 9

Survival of the fittest and VERY slowly.

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Answer 10

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