biology 1 ( chapter 13 )

a major regional or global community of organisms is called

a biome

which phrase best describes biodiversity

an ecosystem

which of the following provide most of the energy in an ecosystem

bacteria

which of the following parts of figure 13.2 are biotic factors

deer,mushroom,tree

what do all the biotic and abiotic factors in a given area make up

detrivores

a group of organisms of the same species that live in the same area is called

ecosystem

which is part of the hydrolic cycle

evaporation

an organism that has an unusually large effect on an ecosystem is called a

keystone species

an ecologist counts weeds to monitor their populatioln's. which of the following best describes their method

observation

what does the diagram in figure 13.1 show

primary consumers

organisms that feed on dead matter are called

producers

which organisms help convert gaseous nitrogen int ammonia in the nitrogen cycle

pyramid of numbers

almost all autotrops get their energy from

sunlight

which model shows the number of organisms at each trophic level in an ecosystem

the carbon cycle

which phrase best describes biodiversity

the number of species in an ecosystem