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(1) A first-order consumer can:
a make its own food
b digest plants
c decompose animals
(2) Why can't an environment support an unlimited number of second-order consumers?
a There is a limited amount of space and water that can sustain secondary consumers.
b There are not enough decomposers to support secondary consumers.
c There are not enough plants to support secondary consumers.
d The population of first-order consumers will disappear if there are too many secondary consumers.