Match each description to the level of organization
organism a group of organs that work together to perform a common function
organ a group of cells that work together to perform a common function
cell the basic unit of structure and function of living things
organ tissue a living thing that is made of organ systems
tissue a group of tissues that work together to perform a common function

Modern whales developed their traits through natural selection what occurs during the process of natural selection

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this