> what insects eat
Depends on your insect. Some are herbivores, some are carnivores/insectivores, some are detrivores, some are parasites.
> do they reproduce sexually or asexually
Depends on your insect, and the time of year. Most reproduce sexually, always. Some, like aphids, will reproduce asexually (parthenogenesis) during part of the year, and sexually during the other part of the year.
Insects have spiracles along their sides, which admit air into a system of tracheoles which conducts air all through the body. Weird, huh?
Insects have an open circulatory system, in which hemolymph bathes the organs.
Main alimentary canal leads to the anus.
Malpighian tubules run throughout the body, and collect and concentrate metabolic wastes from the body cells. The concentrated waste ends up being removed at the anus.
> nervous system
See the link, but generally, each "segment" has paired ganglia, and the insect's "brain" is a fusion of several ganglia.
· 1 decade ago