Which element is considered an essential micronutrient for plants?

a. phosphorus
b. silver
c. molybdenum
d. carbon
e. lead


ANSWER: c

Biology & Microbiology

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Which component of a negative feedback mechanism does the brain or spinal cord represent?

a. response b. sensor c. integrator d. effector e. stimulus

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One benefit of transboundary Peace Parks in Africa is that border fences will be removed and historic wildlife migrations can resume.

a. true b. false

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One of the major causes of panda bears becoming

endangered is a. habitat loss and fragmentation. b. increasing the effects of chemical pollution. c. a sexually transmitted disease that plagues the bears. d. introduced exotic species into a habitat. e. all of these.

Biology & Microbiology

The heart is a(n) ________ composed mainly of ________ tissue?

A. tissue; connective B. organ; connective C. organ; muscle D. tissue; epithelial E. organ; epithelial

Biology & Microbiology