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GAS EXCHANGE - INSECTS

Across
Tiny pores found in insects where carbon dioxide leaves and oxygen enters.
Smaller tubes found in insects that extend throughout their body tissues.
The exchange of substances between the internal and external environments takes place here (two words).
Contract to enable mass movements of air in and out of the body of insects to speed up gas exchange.
Down
INSECTS have evolved to conserve water by increasing this (two words).
An internal network of tubes found in insects.
The type of respiration during high activity in the cells of insects.