Because there are millions of different species. Grouping them makes study a little easier.
it is just useful
none there all bad
yes bats are useful they eat insects and only during night
no the will kill all your plants by eating them.
all of them they help keep the useful ones alive in a food chain which is useful to us
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A quadrat is a small plot that is used in ecology that isolates an area for study. It is useful for studying insects by helping to measure the percentage cover for insect species.
Lobbyists provide ___with useful information that ___an interest groups position
By destroying large numbers of harmful insects.
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It depends on your definition of "useful." In regards to whether caterpillars are beneficial to nature, they are an essential aspect of ecology on numerous levels.