Insects, the dominant invertebrates in innumerable terrestrial
and freshwater habitats, have evolved a few marine species. Only
about 200 aquatic insects have been documented. Some insects
are predators of plant pests, and many pollinate crop vegetables
and fruit trees, which evolved simultaneously with their insect
pollinators. Many insect species transmit disease associated with
bacteria, fungi, or viruses. One such species is the mosquito
Anopheles, which transmits the microbe that causes malaria. For
many carnivorous animals, from ducklings to insect-eating bats,
insects are crucial sources of protein. Carnivorous plants often
live in nitrogen-poor soils and derive nitrogen from the protein
of their insect prey bodies. Silkworms (larvae of moths) are the
only entirely domesticated invertebrate animal.
Insects, the dominant invertebrates in innumerable terrestrial
and freshwater habitats, have evolved a few marine species. Only
about 200 aquatic insects have been documented. Some insects
are predators of plant pests, and many pollinate crop vegetables
and fruit trees, which evolved simultaneously with their insect
pollinators. Many insect species transmit disease associated with
bacteria, fungi, or viruses. One such species is the mosquito
Anopheles, which transmits the microbe that causes malaria. For
many carnivorous animals, from ducklings to insect-eating bats,
insects are crucial sources of protein. Carnivorous plants often
live in nitrogen-poor soils and derive nitrogen from the protein
of their insect prey bodies. Silkworms (larvae of moths) are the
only entirely domesticated invertebrate animal.
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