What is the order of anatomical structures through which a sperm cell passes during maturation and expulsion from

the body?
1. vas deferens
2. epididymus
3. urethra



a. 1-2-3
b. 1-3-2
c. 2-3-1
d. 2-1-3
e. 3-1-2


ANSWER: d

Biology & Microbiology

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In studying fossils, biologists found an insect in a layer of clay, a flower in a layer of sand, a fish in a layer of mud, a reptile in a layer of clay, and a bird in a layer of rock. The insect probably lived at the same time as the 

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Cyanobacteria produce a cell type known as a (cyst/heterocyst/nodule) that protects nitrogenase from the exposure to oxygen.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology