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What factors interact to produce smog?
a. sunlight and pollutants from fossil fuels
b. particulates and pollutants from fossil fuels
c. sunlight and oxygen
d. sunlight and acid rain
Which of these practices has contributed to the depletion of fish populations worldwide?.
a. fishing bans
b. catching reproduction-age fish
c. rotating catches
d. harvest reduction
Question 4
A predator might control an introduced species by
a. keeping the population from increasing.
b. causing habitat fragmentation.
c. increasing available niches.
d. reducing biodiversity in the area.
Question 5
Which level of the food chain is most affected by biomagnification?
a. secondary consumers
b. producers
c. tertiary consumers
d. primary consumers
What would Earth be like without the greenhouse effect?
a. the same temperature as it is now
b. too cold to be habitable
c. a little cooler than it is now
d. a little warmer than it is now
Question 7
Cutting down an entire forest ecosystem is known as
a. selective cutting.
b. clear cutting.
c. harvest reduction.
d. sustainable development.
Question 8
Which of these would probably lead to a decrease in global warming?
a. an increase in the amount of water vapor in the atmosphere
b. a decrease in the amount of methane in the atmosphere
c. an increase in the amount of carbon dioxide in the atmosphere
d. a decrease in the amount of oxygen in the atmosphere
Question 9
What are renewable resources?
a. resources that formed over millions of years
b. resources that can replenish themselves over time
c. resources that exist only in rural areas
d. resources that are used faster than they form
Question 10
How many people can Earth support?
a. 20 billion
b. 50 billion
c. an unknown number
d. 10 billion
Question 11
Because the manatee is an umbrella species, protecting it may lead to
Choose one answer.
a. protection of many other species.
b. pollution of waterways.
c. decreased seagrass.
d. increased boating in their habitat.
Question 12
Which of the following is correct?
a. All ozone in the atmosphere is harmful.
b. Ozone in the stratosphere is helpful but ground-level ozone is harmful.
c. All ozone in the atmosphere is helpful.
d. Ozone in the stratosphere is harmful but ground-level ozone is helpful.
n what biome is biodiversity the highest?
a. temperate forests
b. deserts
c. grasslands
d. tropical rain forests
Question 14
Canned tuna made from small fish is generally considered to be safer to eat than canned tuna from large fish. Large fish have more pollutants
a. because they drink more water.
b. because they live in more polluted water.
c. due to their larger surface area.
d. due to biomagnification.
Question 15
How has the introduction of kudzu affected native species in the southeastern United States?
a. It has increased erosion, so native plants cannot grow.
b. It has covered native plants, depriving them of sunlight.
c. It has attracted animals that eat native plants.
d. It has helped native plants survive harsh weather.
Why are frogs sensitive to pollutants in water?
a. They are not an indicator species.
b. They have a small body mass.
c. They need low-oxygen conditions.
d. They have water-soluble skins.
Question 18
Which statement best describes Earths human carrying capacity?
a. increasing due to improved technology and medicine.
b. decreasing due to increasing population.
c. decreasing due to decreasing death rates.
d. a fixed number that we will soon exceed.
Question 19
Why are humans less sensitive than frogs to pollutants in water?
a. Humans do not have water-soluble skin.
b. Humans do not need water.
c. Humans are affected only by airborne pollutants.
d. Humans need low-oxygen conditions.
Question 20
What causes the level of carbon dioxide in Earths atmosphere to rise and fall over hundreds of thousands of years?
a. ice ages
b. the greenhouse effect
c. natural climate cycles
d. human activities

What factors interact to produce smog? a. sunlight and pollutants from fossil fuels b. particulates and pollutants from fossil fuels c. sunlight and oxygen d. sunlight and acid rain Which of these practices has contributed to the depletion of fish populations worldwide?. a. fishing bans b. catching reproduction-age fish c. rotating catches d. harvest reduction Question 4 A predator might control an introduced species by a. keeping the population from increasing. b. causing habitat fragmentation. c. increasing available niches. d. reducing biodiversity in the area. Question 5 Which level of the food chain is most affected by biomagnification? a. secondary consumers b. producers c. tertiary consumers d. primary consumers

I was assigned this AP biology summer assignment, and i did all of the problems i could and here are some of the problems that i cannot find the answers for, and i would greatly appreciate it if someone would take their time out to help me with this. If your not 100% sure of the answer, just tell me your best guess. “note: that is if you know what your talking about and knowledgeable in this subject”
7.) Ecologists surveying the tree species in two forest plots of different ages. Plot 1 has six different species and 95% of all trees belong to just one species. Plot 2 has five different species, each of which is represented by approximately 20% of the trees. How would you describe plot 2 as compared with plot1?
a) Higher species richness
b) Greater species diversity
c) Lower relative abundance
d) Lower species richness
e) Both b and d are correct
Correct answer:
10.) invasive species often reach a large biomass because
a) They are better competitors than native species
b) They are usually producers and are not top predators.
c) They often lack natural predators or pathogens.
d) Their superior ability to disperse enables them to spread to new niche
e) They are often protected by the humans who have introduced them
Correct answer:
11.) why do most food chains consist of only three to five links?
a) There are only five trophic levels: Producers; primary, secondary, and tertiary consumers; and decomposers.
b) Most communities are controlled bottom-up by mineral nutrient supply
c) The dominant species in most communities consumes the majority of prey; thus, not enough food is left to support higher predators.
d) Acoording to the energetic hypothesis, the inefficiency of energy transfer from one trophic level to the next limits the number of links can exist.
e) According to the trophic cascade model, increasing the biomass of the top trophic levels causes a decrease in the biomass of lower levels, so that the top levels can no longer be supported
Correct answer:
16.) A major explanation for the decline in species richness along an equatorial-polar gradient is the correlation of high levels of solar radiation and water availability with biodiversity. Which of the following is also suggest as a factor in the high species richness of tropical communities?
a) The inverse relationship between biodiversity and evapotranspiration
b) The greater age of these communities (longer growing season and fewer climatic setbacks), providing more time for speciation events
c) The larger area of the tropics and corresponding richness predicted by the species-area curve
d) The lack of disturbances in tropical areas
e) The greater immigration rate and lower extinction rate found on large tropical islands
Correct answer:
18.) Which of the following best describes a zoonotic pathogen?
a) A pathogen that affects insects
b) A pathogen that requires a vector to spread from animal to animal
c) A disease-causing agent that is transmitted to humans from other animals
d) A pathogen that is found in zoos due to the unnatural habitat provided for animals
e) An ectoparasite that is transferred from animals to humans
Correct answer:
I would greatly appreciate it if someone is able to answer any of these questions.above
Also i would greatly appreciate it if someone who knows alot about this subject could tell me if I got these questions below answered right and if not what the correct answer should be.
4.) aposematic coloring is most commonly found in
a) Prey whose body morphology is cryptic
b) Predators who are able to sequester toxic plant compounds in their bodies
c) Prey species that have chemical defenses
d) Good tasting prey that evolve to look like each other
e) Plants that have toxic secondary compounds
Correct answer: E
5.) through resource partitioning
a) Two species can compete for the same prey item
b) Slight variations in niche allow closely related species to coexist in the same habitat
c) Two species can share identical niches in a habitat
d) Competitive exclusion results in the success of the superior species
e) Two species with identical niches do not share the same habitat and thus avoid competition.
Correct answer: B
8.) a palatable (good tasting) prey species may defend against predation by
a) Mullerian mimicry
b) Batesian mimicry
c) Secondary compounds
d) Aposematic coloration
e) Either a or b
Correct answer: D
9.) when one species was removed from a tidepool, the species richness became significantly reduced. The removed species was probably
a) A strong competitor
b) A potent parasite
c) A resource partitioner
d) A keystone species
e) The species with the highest abundance rate
Correct answer: E
Thank you all who take your time out to help me i greatly appreciate it