A roller - coaster car is at the top of the hill , one is at the middle of the hill, and one is at the bottom of the hill . which has the most potential energy A) the car at the bottom of the hill
B) the car in the middle of the hill
C) the car at the top of the hill
D) All the cars have zero potential energy

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

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.