The overall population of a species has increased. what could have occurred to allow this to happen?
the emigration rate is greater than the death rate.
the death rate of the population is greater than the immigration.
the birth rate of the population is less than the death rate.
the immigration of the population is greater than the emigration.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )