Chromosomes are structures that hold DNA, and are usually represented by all ’s in girls, while boys also include a chromosome, in shape. * 4 points
a.2N; X
b. Y; X
c. X; 2N
d. X; Y
e. Y; 2N

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

Which direction does the energy flow in this energy pyramid ?

As an asteroid comes close to earth, it's name will change to? apex