Animal science
1. what species of animals come into heat as the days get shorter
2. at what moment does the ovulation occur within the ovary
3. what supplies nutrients to the fetus during development
4. in what portion of the reproductive tract is the egg fertilized
5. for how long can poultry can store semen
6. what is one function which the vulva and the sheath share
7. what produces the ovum or egg

your answer is "the 1950's"

•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:

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.