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Insects do not have (1) ---- as sharp as that of mammals or birds. The insect compound eye is more familiar to movement and so it cannot (2) ---- position distant objects. So, insects tend to take a rather unsteady flight path to navigate to a particular object. For example, in order to locate the caterpillar, the wasp needs to balance the odor signals (3) ---- by its two antennae.
Y.
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