What exactly is a fossil?
anything more than 5,000 years old that is stone
any object that has been preserved by humans
only the footprints of dinosaurs
any remains or imprints of life that have been naturally preserved

Which element provides strength to the exoskeleton of clams and oysters

Explain how organisms could be harmed by high levels of salt from roadways?

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.