1 A) oak tree B) squirrel C) beetle D) human 2 A) temperature B) air C) water D) sunlight 3 A) oxygen, nitrogen, and carbon dioxide B) gravel, wood, and water C) insects, worms, and bacteria D) sand, humus, and clay 4 A) air B) energy C) water D) sugar 5 A) Mice are eaten as prey. B) Mice wander away to new nests. C) Mice are born. D) Old mice die. 6 A) habitat B) niche C) biotic potential D) carrying capacity 7 A) biome B) atmosphere C) weather D) biosphere 8 A) habitats B) biotic potential C) limiting factors D) symbiosis 9 A) bees collecting nectar from flowers B) birds building nests C) bats eating insects D) deer drinking water from a stream 10 A) three or four B) one or two C) five or six D) four or five 11 A) water B) oxygen C) nitrogen D) carbon 12 A) water vapor B) nitrogen C) oxygen D) carbon dioxide 13 A) photosynthesis B) symbiosis C) decomposition D) precipitation 14 A) those in the first link B) All have the same amount of available energy. C) those in the last link D) those in the middle links 15 A) population B) biome C) ecosystem D) community 16 A) the biosphere B) a population C) an ecosystem D) a biome 17 A) fish in an ocean B) decaying logs in a forest C) bees in a garden D) total rainfall in a desert 18 A) population density B) population decrease C) population spacing D) population size 19 A) clumped spacing B) even spacing C) independent spacing D) random spacing 20 A) predation B) mutualism C) commensalism D) parasitism
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