A physical or biological necessity whose presence in inappropriate amounts limits the normal action of an organism is known as a ____
A) nutrient
B) limiting factor
C) trophic level
D) scarce condition
B
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____________________ are sometimes used to fasten unstable bedrock to stable strata
Fill in the blank(s) with correct word
The relationship between the moose and wolf populations on Isle Royale reveals
A) intraspecific competition. B) top-down and bottom-up population regulation. C) the high and steady environmental resistance on wolves. D) the high and steady environmental resistance on moose.
How much of the region experiences average annual rainfall of less than 250 millimeters (10 inches)?
A) 75%
B) 80%
C) 60%
D) 55%
E) 85%
Which of the following statements best describes how this object may have formed?
A. Material accumulated into a sphere because of gravity, and it underwent nuclear fusion of hydrogen. B. A supernova exploded, probably from the late-stage evolution of a high-mass star. C. A star ejected its outer envelope of gas and plasma. D. Interstellar gas and dust accumulated due to gravity. Some pockets had enough mass to cause star formation.