The mesophyll contains the only cells in the leaf with chloroplasts. these cells are responsible for
a. cellular respiration.
b. photosynthesis.
c. cellular reproduction.
d. transpiration.

B.photosynthesis

Only cells containing chloroplasts can photosynthesize as that is where it takes place.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.