1. what animals dominated the mesozoic era? a. dinosaurs b. fish c. mammals d. amphibians 2. one group of reptiles, characterized by the fossil archaeopteryx, led to the evolution of a. dinosaurs b. birds c. mammals d. cephalopods 3. what likely contributed to the extinction that marks the end of the mesozoic era? a. global warming b. a meteorite collision c. an ice age d. none of the above

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?

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.

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.