Compared with the numbers of grasshoppers or deer, there are not as many mountain lions. The reason that large top-level carnivores are more rare in an ecosystem is because
A. food chains are only 10 to 20% efficient at each step, and top carnivores are therefore limited by the availability of food in their range.
B. through natural selection, most fierce animals have been killed off by others.
C. such animals do not tolerate other members like them.
D. only a few such animals are permitted by succession in a biome, and there are only a few biomes.
Answer: A
You might also like to view...
Metamorphosis occurs in which of the following vertebrate classes?
a. Chondrichthyes b. Reptilia c. Myxiniformes d. Amphibia e. Actinistia
Which hormone stimulates masculine physical characteristics?
a. inhibin b. follicle-stimulating hormone c. interstitial cell stimulating hormone d. luteinizing hormone e. testosterone
Which of the following features are characteristic of fungi?
A) Cell walls, photosynthesis, and usually filamentous bodies B) No cell walls, parasitic, heterotrophic C) Cell walls, chemosynthetic, heterotrophic D) No cell walls, feeding by absorption, chemosynthesis E) Cell walls, feeding by absorption, and usually filamentous bodies
If energy gain remained constant over time, the bird would maximize energy gain by staying on the tree forever.
a. true b. false