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Insects make up what percentage of the world's animals?
Insects make up approximately 80 percent of the total number of animals on Earth.
What are the three parts of an insect's body?
head, abdomen, tail
head, thorax, abdomen
Insects have jointed bodies divided into three segments: the head, thorax and abdomen.
body, wings, legs
Which of the following insects has not evolved much from its original form?
Fossil records show that insects existed 390 million years ago. Some of the earliest insects, such as cockroaches, have changed very little.
Chitin helps form which part of insect anatomy?
Instead of internal skeletons, insects have exoskeletons -- tough outer coverings made up of several layers. The most rigid of these layers is composed of chitin, a horny, waterproof substance.
What do insects use their simple eyes for?
The simple eyes, or ocelli, are located on the head between the compound eyes. The ocelli aren't used for vision, but to detect changes in the intensity of light.
Of the following, which body part do insects not have in common with humans?
Although insects breathe air, they don't have lungs. Instead, a system of branching air tubes, or tracheae, reaches all parts of the body. Air enters through openings called spiracles.
During complete, or indirect, metamorphosis, which developmental stage follows the egg phase?
Complete, or indirect, metamorphosis follows this developmental pattern: egg, larva, pupa, adult.
What percentage of insects are harmful to plants and animals?
Less than 2 percent of all insect species are harmful; but among them, they can cause major crop damage and spread serious diseases.
Which of the following is a sign that an insect is probably safe to eat?
A general rule of thumb is not to eat any brightly colored insect since it's nature's way of warning predators that this insect is poisonous.
Around how many ethnic groups practice entomophagy, or bug eating?
There are 1,417 species of edible insects and nearly 3,000 ethnic groups that currently practice entomophagy around the world.
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