Bug - metamorphosis
Cow - produce milk through mammary gland
Worm - regenerate
Sponges - regenerate
<h3>
Animal Processes</h3>
Bugs generally belong to the insect group that grows by metamorphosis. While some undergo complete metamorphosis, some undergo incomplete metamorphosis.
Cows generally belong to the group of animals known as mammals. They have mammary glands which serve as milk-producing glands for the nourishing of young ones.
Sponges and some worms are able to regenerate new organisms from their broken parts.
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If want a direct answer it would be the decrease in mice, but if you want to get technical the decrease in grain spills caused mice to leave so that would be the indirect cause
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Frequently changing their surface proteins