During spermatogenesis, the first meiotic division yields two ____, and the second meiotic division yields four ____
a. primary spermatocytes; secondary spermatocytes
b. secondary spermatocytes; spermatids
c. spermatids; spermatozoa
d. spermatogonia; primary spermatocytes
e. spermatogonia; secondary spermatocytes
B
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Which of the following helped adapt the human skull for bipedalism compared with an ape’s skull?
A. The foramen magnum is more posterior. B. The foramen magnum is more superior. C. The face is flatter. D. There is more weight anterior to the occipital condyles.
The primary function(s) of the respiratory system is (are):
to move air to and from the exchange surfaces to provide an area for gas exchange between air and circulating blood to protect respiratory surfaces from dehydration and environmental variations to provide structures for phonation all of the choices are correct
Agglutination of red blood cells means
A. they clump together. B. they lose their nucleus. C. they rupture. D. they form a clot. E. they bump into each other.
Damage to which of the following muscles would interfere most with the ability to breathe?
A) platysma B) obliques C) diaphragm D) pterygoid