13. what is the impact of increased levels of greenhouse gases on earths climate?
a. reduced sea levels
b. more stable weather patterns
c. enhanced greenhouse effect leading to global warming
d. lower global temperatures

14. in an ecosystem, which organisms convert sunlight into energy - rich organic compounds?
a. primary producers
b. decomposers
c. tertiary consumers
d. consumers

17. what term best describes the role of sea otters in kelp forest ecosystems?
a. keystone species
b. predators
c. decomposers
d. primary producers

18. in a predator - prey relationship, which of the following scenarios would most likely occur if most predators were removed from an ecosystem?
a. the prey population would remain stable
b. the prey population would likely decrease
c. the prey population would likely increase
d. the prey would immediately evolve new traits

19. which country is known for its extensive use of wind energy to combat climate change?
a. denmark
b. united states
c. china
d. brazil

20. which trophic level usually contains organisms with the highest biomass in an ecosystem?
a. decomposers
b. secondary consumers
c. tertiary consumers
d. producers

21. which of the following best describes the role of producers in an ecosystem?
a. they consume other organisms for energy
b. they break down dead organic matter
c. they prey on primary consumers
d. they create their own food through photosynthesis

Question

13. what is the impact of increased levels of greenhouse gases on earths climate?
a. reduced sea levels
b. more stable weather patterns
c. enhanced greenhouse effect leading to global warming
d. lower global temperatures

14. in an ecosystem, which organisms convert sunlight into energy - rich organic compounds?
a. primary producers
b. decomposers
c. tertiary consumers
d. consumers

17. what term best describes the role of sea otters in kelp forest ecosystems?
a. keystone species
b. predators
c. decomposers
d. primary producers

18. in a predator - prey relationship, which of the following scenarios would most likely occur if most predators were removed from an ecosystem?
a. the prey population would remain stable
b. the prey population would likely decrease
c. the prey population would likely increase
d. the prey would immediately evolve new traits

19. which country is known for its extensive use of wind energy to combat climate change?
a. denmark
b. united states
c. china
d. brazil

20. which trophic level usually contains organisms with the highest biomass in an ecosystem?
a. decomposers
b. secondary consumers
c. tertiary consumers
d. producers

21. which of the following best describes the role of producers in an ecosystem?
a. they consume other organisms for energy
b. they break down dead organic matter
c. they prey on primary consumers
d. they create their own food through photosynthesis

Accepted Answer

### Question 15
# Brief Explanations:
Greenhouse gases trap heat. Increased levels enhance the greenhouse effect, causing global warming. Option a is wrong (sea levels rise with warming), b is wrong (weather becomes more unstable), d is wrong (temperatures rise, not lower).
# Answer:
c. Enhanced greenhouse effect leading to global warming

### Question 16
# Brief Explanations:
Primary producers (like plants) perform photosynthesis, converting sunlight into energy - rich organic compounds. Decomposers break down matter, tertiary consumers and consumers eat other organisms, not convert sunlight.
# Answer:
a. Primary producers

### Question 17
# Brief Explanations:
Apex predators (like top - level carnivores in a forest) control prey populations, maintaining ecosystem balance. They are not decomposers (break down matter), primary producers (make food via photosynthesis), or just regular predators (apex are top - level).
# Answer:
a. Keystone species (Note: Apex predators can be keystone species as they regulate ecosystems. If the option was about apex predators' role, but among the options, keystone species fits as apex predators often have a keystone role. If the original option was misread and 'apex predators' was an option, but based on the given options, keystone species is the best as apex predators act as keystone species by controlling prey and maintaining ecosystem structure.)

### Question 18
# Brief Explanations:
In a predator - prey relationship, if most predators are removed, the prey population, with less predation pressure, is likely to increase. Option a is wrong (no predators to control, so not stable), b is wrong (prey would increase, not decrease), d is wrong (removing predators doesn't immediately make prey reach new traits).
# Answer:
c. The prey population would likely increase

### Question 19
# Brief Explanations:
Denmark is known for its extensive use of wind energy to combat climate change. The US, China, and Brazil have wind energy but Denmark is more renowned for its wind energy adoption.
# Answer:
a. Denmark

### Question 20
# Brief Explanations:
In an ecosystem, energy decreases as we move up trophic levels. Producers (like plants) are at the lowest trophic level and have the highest biomass as they are the base of the food chain, supporting other levels. Decomposers recycle matter, secondary and tertiary consumers are higher up with less biomass.
# Answer:
d. Producers

### Question 21
# Brief Explanations:
Producers (like plants) create their own food through photosynthesis (converting sunlight, CO₂ and water into glucose). Option a is for consumers, b is for decomposers, c is for secondary consumers (they prey on primary consumers, but producers don't prey, they make their own food).
# Answer:
d. They create their own food through photosynthesis

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