How does the nervous system work with the endocrine system?

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.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

You see a white marker with an orange circle and black lettering. what does this marker tell you