Pre-Test
DIRECTION: Rend ench statement carefully. Encircle the letter of the correct answer in your answer sheet.

1. It occurs when the last species dies.

a Population
b. Extinction
c. Deforestation
d. Eutrophication

2. The reverberations of their impact to Earth can be felt around the world. The impact site is completely
destroyed. Radiation is being emitted from outer space and the sun. A supernova remnant is one
source of cosmic radiation.

a. Asteroids/cosmic radiation
c. Disease/epidemic
b. Climatic heat and cooling
d. Climatic change and global warming

3. This is the result of melting freshwater. The denser, saltier water sinks and forms the currents that
marine life depends on. Ocean floor spreading and rising also affects sea level.

a. Acid rain
c. Climatic heat and cooling
b. Climatic change and global warming d. Changes in sea levels or currents

4. The biodiversity Earth can't keep up with the rapid changes in temperature and climate. The species are
not used to severe weather conditions and long seasons.

a. Changes in sea level or currents
c. Climatic change and global warming
b. Acid rain
d. Climatic heat and cooling

5. Each species has defense mechanisms like immunities and the ability to fight disease. With the
changing climate and landscape certain species are losing their ability to fend off disease. They are
becoming more susceptible to disease and epidemics, which can lead to their eventual extinction

a. Asteroids/cosmic radiation
c. Climatic change and global warming
b. Disense/epidemio
d. Human causes of extinction

6. This forms when sulfur dioxide and/or nitrogen oxides are put into the atmosphere. Increases the acidity
of the soil which affects plant life. It can also disturb rivers and lakes to a possibly lethal level.

a. Acid rain
c. Habitat degradation
b. Asteroids/cosmic radiation
d. Human causes of extinction

7. They use resources that the other species depend on. Once competition gets too great, the survival of the
fittest plan will begin, and one of the species, usually the natural one, will die off.
a. Spread of invasive species
c. Disease epidemic
b. Human causes of extinction
d. Habitat degradation

8. Increase in population, destruction fragmentation of habitat, pollution and climate change global
warming

a. Acid rain
c. Habitat degradation
b. Asteroids/cosmic radiation
d. Human causes of extinction

9. Habitat loss and degradation affect 86% of all threatened birds, 86% of mammals and 88% of threatened
amphibians.

a. Acid rain
c. Habitat degradation
b. Asteroids/cosmic radiation
d. Human causes of extinction

10. From John W. Williams research, their findings indicated that "By the end of the 21st century, large
portions of the Earth's surface may experience climates not found at present and some 21st century
climates may disappear

a. Asteroids/cosmic radiation
c. Disease epidemic
b. Climatic heat and cooling
d. Climatic change and global warming

11. A group of organisms that have certain characteristics in common and are able to interbreed.

a. population
b. species
c. biodiversity
d. carrying capacity

12. Refers to the variety of individuals in an aren.

a. population
b. species
c. biodiversity
d. carrying capacity

13. Number of organisms of one species that an environment can support.

a. population
b. species
c. biodiversity
d. carrying capacity

14. The total number of organisms of the same species inhabiting a place at the same time.

a population
b. species
c. biodiversity
d. carrying capacity

15. Species in which the number of individuals falls so low that extinction is possible

a. threatened
b. end endengerd
c. unthreatened species
d. out of danger species​