Question

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Answer 1

Answer:

the existence of a number of different kinds of animals and plants which together make a good and healthy environment

Answer 2

hey

Spiracles are the openings of the

tracheal system on the integument of the insect. Some apterygote and larval insects lack valves in their spiracles and therefore have trachea that are always open to the environment, although these are often covered with sieve-like plates