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