Which process can be described as two cell divisions, genetic variation, and haploid cells?
a. meiosis
b. mitosis
c. binary fission
d. fertilization

The correct answer is option A, meiosis

Reason -

In a meiosis cell division the number of chromosomes usually reduces by half of its original number. It helps in the production of gametes—sex cells, or sperm and eggs. In the phase I of meiosis, diploid cell is formed while in phase II of meiosis, haploid cell is formed.  Meiosis produces sex cells which are responsible for causing the genetic variation.

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:

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation: