Sperm are formed from the direct maturation of
a. sperm mother cells.
b. spermatids.
c. spermatogonial cells.
d. primary spermatocytes.
e. secondary spermatocytes.
Answer: b
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Answer the following statement true (T) or false (F)
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A. ectoderm. B. protoderm. C. pachyderm. D. endoderm. E. mesoderm.
The ____ are very common arthropod Paleozoic fossils, and are extinct today
a. phoronids b. trilobites c. tardigrades d. moss animals e. lophophorate animals What will be an ideal response?
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Indicate whether the statement is true or false