Which factor has the least effect on the amount of incoming light that strikes an area?
a. latitude
b. temperature
c. particulate matter in the atmosphere
d. total surface area that sunlight strikes
e. Earth's tilt
b
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A chromosome whose centromere is placed very close to, but not at, one end is called a(n) ____________________ chromosome
Fill in the blank(s) with correct word
Timber wolf populations are partially controlled by wolf behavior. For example, wolves form packs and are territorial. Therefore, only a finite number of wolves will comprise a pack and occupy a relatively large territory. Which of the following best describes this type of population-regulating mechanism?
a. competitive exclusion mechanism b. niche-controlling mechanism c. habitat-controlling mechanism d. extrinsic mechanism e. intrinsic mechanism
In some G-protein-coupled-receptors, cyclic AMP (cAMP) acts as a(n)
1.first messenger. 2.second messenger. 3.effector. 4.protein kinase. 5.extracellular signal.
Peripheral vasodilation is a response to
a. heat. b. hunger. c. cold. d. exercise. e. thirst.