Question

1. why do some traits of the same species vary?
2. what conditions must be met in order for natural selection to occur?
3. how do changes in the environment affect species?

Explanation:

1. Traits vary in the same species due to genetic mutations and sexual reproduction which create genetic diversity.
2. For natural selection to occur, there must be variation in traits within a population, over - production of offspring, competition for resources, and differential survival and reproduction based on those traits.
3. Changes in the environment can affect species by creating new selection pressures. Traits that were once neutral or less advantageous may become beneficial or vice - versa, leading to changes in the frequency of traits in the population over time.

Answer:

1. Traits of the same species vary because of genetic mutations and sexual reproduction that introduce genetic diversity.
2. For natural selection to occur, there must be trait variation in a population, over - production of offspring, resource competition, and differential survival and reproduction based on traits.
3. Environmental changes affect species by altering selection pressures, which can change the frequency of traits in a population over time.