How might sexual reproduction decrease an organisms chance of survival?

Which is the best way to define a common in environmental science a. a worthless resource b. shared resource c. a rare resource d. a typical resource

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

How many major plates cover the earth