Please help asap The graph below shows changes in the number of families of organisms that existed during a time period in Earth's history. Which of the following describes what would most likely be happening between points Y and Z on the graph?

Adaptive radiation is occurring following a mass-extinction event.
A mass extinction is occurring as a result of changing environmental conditions.
Genetic variation is increasing as a result of the fusion of hybrid zones.
The total population of organisms is increasing as a result of genetic drift.

What adaptation is apparent in the bodies of the three tortoise species shown in figure 16-2

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

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.