We have already talked about another class of chemicals that helps send signals in the body—neurotransmitters. How are neurotransmitters and hormones similar and how are they different?

answer///multiple alleles;

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.