Which ecosystem with fertile soil has been mainly

11 Jun Which ecosystem with fertile soil has been mainly

Question
1. Which ecosystem with fertile soil has been mainly converted into agricultural farmlands for human use?

Select one:

a. Tropical rain forest

b. Tundra

c. Desert

d. Temperate grasslands

e. Taiga

2. What occurs during the later stages of allopatric speciation?

Select one:

a. evolution ceases for a time

b. reproductive isolation between the subpopulations occurs

c. wide phenotypic differences disappear between subpopulations

d. gene flow continues between the two populations

e. reproduction continues between the two populations

3. Ecology is defined as the study of __________.

Select one:

a. Organisms as they interact with other organisms and their physical surrounding

b. Population increases and decreases

c. How populations are restricted by environmental resistance

d. Populations

e. The rate of population change

4. Which of the following statements about differential gene expression is true?

Select one:

a. It would leave unchanged the size of a particular structure

b. It might maintain the function of an organ

c. It could identically color skin

d. It might change leg length between species

e. It might cause a species to grow as long as another

5. What portion of the antibody binds to an antigen?

Select one:

a. The variable portion

b. The constant portion

c. The heavy chain portion

d. The variable and constant portion

e. The antigen receptor portion

6. What type of characteristics appear in some new groups but not in all new group?

Select one:

a. parallel characters

b. ancestor characters

c. convergent characters

d. analogous characters

e. derived characters

7. Which of the following organisms have a one-way ventilation mechanism?

Select one:

a. Mammals

b. Birds

c. Reptiles

d. Amphibians

e. Earthworms

8. All of the following are advantages of having a coelom except _________.

Select one:

a. It provides free body movements due to the coelom

b. It provides more space for organs to develop

c. It helps organisms such as flatworms and roundworms move

d. The coelomic fluid protects internal organs

e. It can assist in the storage and transport of substances

9. Complete this sentence to clarify how air currents affect rainfall patterns. At the equator, __________; whereas at 30 degrees north and south latitude, ____________.

Select one:

a. dry air rises away from Earth’s surface; warm moist air sinks

b. warm moist air sinks to Earth’s surface; dry air rises

c. warm moist air rises, cools and becomes rain; dry air sinks to Earth’s surface

d. warm moist air rises; warm moist air turns into rain

e. dry air sinks to Earth’s surface; warm moist air rises, cools and becomes rain

10. What characteristic was present before the adaptation of reptiles for life on land?

Select one:

a. hard, horny scales

b. internal fertilization

c. shelled egg

d. ectothermic physiology

e. more advanced skeleton