Which element is considered an essential micronutrient for plants?
a. phosphorus
b. silver
c. molybdenum
d. carbon
e. lead
ANSWER: c
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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
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
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.
The heart is a(n) ________ composed mainly of ________ tissue?
A. tissue; connective B. organ; connective C. organ; muscle D. tissue; epithelial E. organ; epithelial