★ Embryology Quiz
The fibrous wall layer of a mature anther
A. Epidermis
B. Endothecium
C. Tapetum
D. Middle layer
Select your answer:
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Respiratory System › ViewIn humans, what happens when the breathing rate increases?
A. Additional oxygen will diffuse into the blood as carbon dioxide diffuses out of the blood in the lungs.
B. Additional carbon dioxide will diffuse into the blood as oxygen diffuses out of the blood in the lungs.
C. Oxygen from body cells will diffuse more rapidly into red blood cells.
D. Increased oxygen dissolved in the blood will stimulate the cerebrum to slow the breathing rate.
Mechanical Digestion › View
what is the function of premolar
A. bitting off pieces of food
B. similar function to incisors
C. tearing and grinding food
D. chewinv and grinding food