Lultiple Choice 1-4 1. Read the selection from the section "Predators."
“Lacking a top predator, elk populations in Yellowstone exploded.
Elk herds competed for food resources, and plants such as grasses,
sedges and reeds did not have time or space to grow back."
→ Why does the author use the word "exploded"?
a. to suggest the violence with which predators hunt
b. to suggest the shock of scientists at the lost predators
c. to convey the speed at which the elk population grew
d. to convey the excitement of elk at having no predators

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.