What is the collective role of water vapor, carbon dioxide, ozone, and methane in the atmosphere?

a) they prevent the harmful ultraviolet radiation of the sun from reaching earth.
b) they are important components of the water cycle, which regulates earth's temperature.
c) they regulate earth's climate by trapping heat and holding it within earth's atmosphere.
d) they scatter almost a third of the sunlight that reaches the outer layers of the atmosphere back into space.

Enzyme speed up chemical reaction are which type of marcomolecule? a. carbohhydrates b. protiens c. lipids d. nucleic acids

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.

Match each symbol with its description.