Question

help please c;


8. Which of the following best describes how a biotic factor can limit the population growth in a species? (2 points)

A. A parasite invades the species and causes its population to decline.

B. A sudden drop in temperature causes nearly half of the species’ population to die.


C.Disease leads to a decline in the reproductive rate of the species’ main predator.


D. Lack of rainfall over a long period of time forces the species to migrate to a new location.

Answer 1

MORE QUESTIONS . PLEASE HELP . I WILL GIVE YOU A MEDAL .

9. Which of the following best explains how introducing an invasive plant species to an ecosystem would affect the ecosystem over a long period of time? (2 points)

A. It would benefit the ecosystem since the plant species would serve as a food source for herbivores.

B.It would harm the ecosystem since the plants would compete with native plants for water, sunlight, and space.

C. The plants would crossbreed with native plant species and increase biodiversity in the ecosystem.

D. The plants would eventually form mutualistic relationships with native plant species.

Answer 2

the first one is a

Answer 3

#9 is b

Answer 4

10. Which of the following best explains this natural phenomenon? (2 points)

A. The rabbit population decreases as the rabbits migrate to escape predators, and the wolf population decreases as the wolves follow their prey.
B. The populations of wolves and rabbits increase at the same rate when environmental conditions are favorable and decrease when conditions are unfavorable.
C. The rabbit population increases after a decrease in wolf population because wolves and rabbits compete for some of the same resources.
D. The wolf population increases after an increase in rabbit population, and then decreases when rabbits are less readily available.

Answer 5

11. In a forest ecosystem, a species of bird was introduced. The birds had few predators and for a period of time its population rose steadily and then roughly leveled off. Which of the following conclusions provides the best explanation for this phenomenon? (2 points)
A. A predator of the birds entered the ecosystem, causing the bird population to level off.
B. Another species of bird was introduced, and the two species competed for nesting sites and food.
C. Migration of birds into the ecosystem began to decline, and emigration began to increase.
D. The ecosystem reached its carrying capacity, and was not able to support continued population growth.

Answer 6

12. Every year, millions of acres of land are cleared by uncontrolled forest fires. Which of the following best describes a consequence of these catastrophic events? (2 points)
A. Biodiversity will increase as new species move into the cleared area.
B. Invasive species will quickly take over the disturbed area.
C. Oxygen levels decrease rapidly in the areas near the fire.
D. Only the plants that benefit from fire will survive.

Answer 7

13. Scientific research shows that our global climate is changing. Ocean temperatures and acidity are increasing and the global sea level is rising. Which of the following best predicts an outcome of this global climate change in a marine ecosystem? (2 points)
A. Many marine species will not be able to adjust quickly enough to survive.
B. More species will be able to survive due to the less extreme temperatures in the ocean.
C. Tectonic plate activity will increase and produce warmer ocean temperatures.
D. The increased acidity will make it more difficult for harmful bacteria to survive.

Answer 8

12 is d

Answer 9

13 is a

Answer 10

14. Which of the following is the best example of a way human lifestyles affect environmental systems? (2 points)
A. Burning fossil fuels increases the amount of greenhouse gases in the atmosphere.
B. Deforestation causes water pollution by decreasing water vapor in nearby lakes and rivers.
C. Using aerosol sprays increases the amount of ozone (O3) in the atmosphere.
D. Using radioactive materials causes ground pollution when chlorofluorocarbons (CFCs) seep into the ground.

Answer 11

11 is d

Answer 12

15. Which of the following changes should be implemented to help achieve sustainable farming while also protecting the environment? (2 points)
A. clearing land for agriculture by cutting down trees instead of burning them
B. growing the same crop in a given field each year to improve efficiency
C. tilling the ground to remove weeds and create uniform crops
D. using predatory insects to control pests that destroy crops instead of pesticides

Answer 13

16. Which of the following best describes environmental parameters that should be examined before a city can build a landfill? (2 points)
A. how close the landfill will be to major cities and highways
B. if leakage from the landfill will be able to contaminate groundwater
C. what the costs involved in maintaining the landfill will be
D. whether there will be sufficient staff available to operate the landfill

Answer 14

17. Which of the following best describes what happens to water molecules after they have condensed to form clouds? (2 points)
A. They will combine to form runoff and flow into rivers, lakes, and oceans.
B. They will fall to Earth as precipitation in the form of rain, sleet, or snow.
C. They will undergo evaporation and change to a gas.
D. They will undergo transpiration and become water vapor.

Answer 15

18. Which of the following best describes a benefit of one type of nonrenewable energy? (2 points)
A. Coal is relatively inexpensive compared to other forms of energy.
B. Natural gas does not produce greenhouse gases as other energy sources do.
C. Nuclear power does not produce any form of pollution.
D. Petroleum can be found nearly anywhere and is easily extracted.

Answer 16

19. Which of the following best describes the long-term impact of using a renewable energy source? (2 points)
A. Biomass releases greenhouse gases when burned.
B. Geothermal energy can pollute water supplies.
C. Natural gas causes air pollution when burned.
D. Nuclear power produces harmful radiation.

Answer 17

Please help me with the rest of these questions and I will give you a medal c:

Answer 18

this is alot of freakin questions

Answer 19

it's my unit exam i am sorry . i would give you as many medals as possible but it will only give you one medal :p thank you for helping me doe