Animal studies indicate that: a) mammals may be relatively better at solving problems than birds b) birds have far superior reasoning skills when compared to other animals c) animals do not learn from previous experience d) animals are incapable of solving problems in their environment.

a) mammals may be relatively better at solving problems than birds

Explanation:

The most renowned case of critical thinking creatures are chimpanzees. Science has demonstrated  that apes are competent to take care of issues that require unique thinking. Nowadays, our feathery friends  are being  watched for causal thinking and it is indicated that certain birds are capable of  critical thinking errands.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

you know they are heterozygous for a trait because they have it as jj or jj.