The coelomic cavity is derived from the
A. splitting of the mesoderm.
B. space left after organs develop.
C. folding of the neural tube.
D. blastocoel.
E. elimination of the yolk sac nutrients.
Answer: A
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a. left atrium, right ventricle, right atrium, left ventricle b. left atrium, left ventricle, right atrium, right ventricle c. right atrium, right ventricle, left atrium, left ventricle d. right atrium, right ventricle, left ventricle, left atrium
All EXCEPT which of the following hormones are in
some way responsible for the production of sperm? a. luteinizing hormone b. follicle-stimulating hormone c. gonadotropic-releasing hormone d. testosterone e. human chorionic gonadotropin
Gene silencing is a form of regulation controlled by repressor proteins
Indicate whether the statement is true or false
The ________ made diverse tools, including spearheads and hand axes, and lived in huts or caves.
Fill in the blank(s) with the appropriate word(s).