Which type of gland can become blocked and form a "blackhead"?

A. sebaceous
B. sudoriferous
C. sweat
D. endocrine
E. compound


Answer: A

Biology & Microbiology

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One line of evidence for endosymbiosis is that chloroplasts resemble ____

a. anaerobic bacteria b. aerobic bacteria c. fungi d. protists e. cyanobacteria

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Breathing rates are automatically increased when _____ levels are _____

a. oxygen; high b. carbon dioxide; high

c. oxygen; low d. carbon dioxide; low e. ATP; low

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Which of the following statements relate to natural selection?

A) differential reproductive success B) competition for resources C) heritable variation D) breeding to increase the frequency of desired traits E) fitness

Biology & Microbiology

How many types of amino acids human body needed to build proteins?

a. 11 b. 20 c. 2 d. 46

Biology & Microbiology