Salinization of water used in irrigation has reduced crop yields by ____

a. 10 percent
b. 25 percent
c. 33 percent
d. 50 percent
e. 75 percent


ANSWER: b

Biology & Microbiology

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It is clear from current research on human behavior genetics that _____

a. animal models of human disease are not useful for behavior research b. epigenetics does not play a significant role in behavior disorders c. few abnormal behaviors have an environmental component d. most abnormal behaviors are due to single-gene effects e. abnormal behaviors are not due to single-gene effects

Biology & Microbiology

How many phenotypic classes may be generated from a three-point testcross?

A) (3)2 = 9 B) (2)3 = 8 C) (3)3 = 27 D) (2)2 = 4 E) It cannot be predicted.

Biology & Microbiology

Human are only one species of many different primates that prefer to walk upright on two legs

Indicate whether the statement is true or false

Biology & Microbiology

In a market economy, a supply restriction occurs when a single firm monopolizes a market

a. true b. false

Biology & Microbiology