What is the most commonly employed form of birth control in the United States?
A. abstinence
B. prevention of ovulation by hormonal inhibition
C. sperm blockage with condoms
D. sterilization
E. prevention of embryo implantation with IUD
C. sperm blockage with condoms
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A Paramecium is an example of a ________.
A. tertiary consumer B. quaternary consumer C. primary producer D. secondary consumer E. primary consumer
While wastewater is in an activated sludge tank, much of the organic matter is
A) oxidized. B) adsorbed to the floc. C) incorporated into microbial cells. D) oxidized, adsorbed to the floc, and incorporated into microbial cells.
Saltatory conduction is the slowest form of action potential propagation
Indicate whether the statement is true or false.
Which of the following is a common reason for hybrid infertility?
a. They express mechanical incompatibility. b. They are found to be ecologically isolated. c. A common reason for hybrid infertility is the failure of chromosomes to pair properly during meiosis. d. They fail to reach sexual maturity.