This is a requirement for natural selection to occur.

a.) heritable variations for some traits
b.) the ability of an organism to improve a trait during its lifetime
c.) equal probability of survival for all offspring
d.) fewer offspring than the environment can support

Heritable variations for some traits are required for natural selection to occur.

Further Explanation:

Natural selection favors the history that increases lifetime reproductive success.It depends on the adaptive capacity of the organisms to environmental changes. It is a process in which different organisms in a population are adapted to the environment increase in frequency relative to the less-adapted forms over a different number of generations. The main conditions to occur natural selection are:

• Reproduction

• Variation in characters

• Heredity

• Variation in fitness

The pre-existing heritable variation in the group is the major condition for natural selection to happen in the environment between the species. Fittest phenotypes are responsible for evolution by natural selection.The production of different sizes and the number of individuals due to natural selection would depend on certain conditions.If there is no effect of size on reproduction and survival, then the production of the highest number of offspring would be beneficial in the expression of genes in subsequent generations.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Evolution

Keywords:

Natural selection, size, fittest phenotype, evolution, species, generations, reproduction, subsequent variation, reproduction.

it's unlikely a majority of a large population would agree on issues

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