Which best describes the blood flowing in an artery?
a. it contains no red blood cells.
b. it is oxygen poor.
c. it moves away from the heart.
d. it contains no white blood cells.

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.

Dna is colied into chromosomes in a cell

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.