The answer is A.True but they are not the only ways in which this can occur.
Answer:
gas station, or butt
Explanation:
the gas station can fill your car and exchange gas with the pump. when you fart you exchange gas with the air.
B. sexual selection, which alters allele frequencies in the gene pool.
Answer:Were all worthless in this world!!!!!
Explanation:This should be obvious, we only live and then die.
Replication/ reproduction. one side copies then replicates and matches up. hope this helps