Practice
What percent of the Cenozoic era is repre-
sented by the Neogene period, which lasted
from 23 mya to 2.6 mya? [Hint: Subtract to find
the length of the Neogene period.]

Which layer will become saturated first when rain falls?

Which of the following is required of a new drug?me

Label the steps for protein synthesis in order, beginning with the first steponce the protein is made, the gene for a particular trait is expressedmrna joins the ribosome, and the anticodons from trna join mrna to form a chain ofamino acidsrna polymerase unzips dna and free rna nucleotides join dna to form mrnav a chain of amino acids is formed from peptide bonds, creating a proteinmrna is transported from the nucleus of the cell to the ribosomes of the cell.