What does the pulmonary vein do? O A. Carries carbon dioxide-rich blood from the heart to the lung
O B. Carries carbon dioxide-rich blood from the lung to the heart
O C. Carries oxygen-rich blood from the heart to the lung
O D. Carries oxygen-rich blood from the lung to the heart

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Which is a function performed by stem cells in the skin a. replacing lost skin cells b. making cells for the intestines c. growing new organs d. differentiating into brain cells plz apex