What structure is formed from both fetal and maternal tissue?
A. Yolk sac
B. Amnion
C. Placenta
D. Chorion
Answer: C
Biology & Microbiology
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The sex of a human is determined by:
a. the number of chromosomes. b. the number of autosomes. c. the presence of only one X chromosome. d. the number of sex chromosomes. e. the presence of a Y chromosome
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Environmental change causes the heritable variations in individuals that natural selection acts upon
Indicate whether the statement is true or false
Biology & Microbiology
Blood flows most slowly through the _______.
a) aorta b) veins c) arteries d) heart e) capillaries
Biology & Microbiology
The Himalayas are an example of a mountain range that formed as a result of
A) the collision of two continental plates. B) the separation of two continental plates. C) the buildup of sediments and conversion to rock. D) volcanic eruptions.
Biology & Microbiology