The Insects -

: Most have large eyes made of many tiny lenses, which are excellent at detecting motion. Major Roles in Nature

Most insects undergo , a dramatic change in form from birth to adulthood. The Insects

: A hard external shell made of chitin that protects their organs. Because this shell cannot grow, insects must periodically molt to increase in size. : Most have large eyes made of many

: A single pair of "feelers" on the head used for sensing touch, smell, and sometimes sound. Because this shell cannot grow, insects must periodically

: Scientists estimate there are roughly 1.4 billion insects for every human on Earth.

: Insects act as nature's janitors, breaking down dead plant and animal matter, which returns vital nutrients to the soil.

Insects are crucial to the planet's health, performing roles that humans often take for granted: