The wood duck shown in the above photograph was adversely affected by ____ and is making a comeback thanks to

____.
a. global cooling; heat producing chemical added to their diet
b. sexually transmitted viruses; a new vaccine
c. limited numbers of natural cavities; artificial nesting boxes
d. high incidence of males being born; transplantation of females from other areas
e. invasive species; removal of introduced predators


ANSWER: c

Biology & Microbiology

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Muscles often function in pairs, with the action of one muscle ____________________ the action of the other

Fill in the blank(s) with correct word

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Pain projected by the brain back to a missing body part is called

a. phantom pain. b. referred pain. c. projected pain. d. erroneous pain. e. perceived pain.

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Atoms have no electric charge because they have ________.

A) uncharged neutrons in their nuclei B) an equal number of protons and neutrons C) an equal number of protons and electrons D) an equal number of charged and uncharged subatomic particles

Biology & Microbiology