What is part of the theory of evolution by natural selection?

Answer 1

One part of the theory of evolution by natural selection is that only the best-adapted animals in a population survive.

Small changes add up over many generations.

Answer 2

Animals that survive cannot pass along their adaptation

Answer 3

Evolution is the gradual process of change by adaptation that occurs over a period of time. Natural selection basically refers to 'survival of the fittest'. This means, the organisms that have the most favoured traits for the particular environment in which they inhabit, will live. For example, moths that are a greenish colour will survive in a forest through camoflauge while bright purple ones may not. Therefore the green moths will survive and reproduce more moths with this favoured trait of colour.



In short, adaptive traits (that is, traits which tend to result in survival to the age at which an individual produces offspring, as well as enabling the offspring to survive to produce their own offspring) are more likely to survive in subsequent generations, and the genes which produce those traits therefore have greater representation in the gene pool. This process of "natural selection" causes those adaptive traits to become more prevalent over successive generations, while the genes representing less adaptive traits will have lower representation in the gene pool.

Answer 4

Evolution is almost all about natural selection.

When Charles Darwin wrote his book on evolution, he proposed that natural selection causes living things to inherit the "better" traits. Thus, evolution is the change in the inherited traits of a population of organisms through successive generations. For more information, check out Amazon.com and search Charles Darwin origins. Look for the information and see what it says. Also go on Wikipedia :D

Answer 5

That all organisms vary. That there are more organisms born than the environment can support. That this leads to a struggle for existence in which the organisms whose variance causes then to survive and reproduce in greater numbers will leave more descendents that have this selfsame successful variation.

Thus alleles change over time in populations of organisms and this is evolution.

Answer 6

Only the best adapted animals in a population survive.

Answer 7

New generations are better suited to survive than previous generations