Affiliate Marketing Secrets

1. Which of the following are biotic factors and which are abiotic factors? (1 point)
Rain and grass are biotic; wind and humidity are abiotic.
Algae and fungi are biotic; temperature and rainfall are abiotic.
Oxygen and sunlight are biotic; maple trees and spiders are abiotic.
Fish and whales are biotic; plankton and bacteria are abiotic.
2. Why is it useful for an ecologist to identify the keystone species in an ecosystem? (1 point)
The keystone species is only important in early stages of succession, and so the ecologist can safely ignore changes in its population at later stages.
The keystone species is the most susceptible to pollution, and so its numbers give an indication of the levels of pollutants in an area.
The keystone species is critical to maintaining the stability of an ecosystem, and changes in its population indicate changes in ecosystem health.
The keystone species is important for the cycling of matter and must be maintained or the biogeochemical cycles will be affected.
3. Competition over resources occurs between organisms (1 point)
participating in an herbivorous relationship.
forming a symbiotic relationship.
attempting to occupy the same niche.
initiating primary succession after a disturbance.
4. The lowest trophic level in an ecosystem (1 point)
has the lowest quantity of stored energy.
has the greatest biomass.
is made up of heterotrophs.
contains detritovores.
5. What is true of the energy that is passed from one trophic level to the next in a food chain? (1 point)
About 10% of the energy passed from one level to the next is released as heat.
About 10% of the stored energy of one level becomes stored energy at the next higher level.
The energy at each level increases by about 10% with each move up in trophic level.
The total energy at all trophic levels is constant, but only about 10% is available for use by organisms for life functions.
6. Autotroph is to producer as heterotroph is (1 point)
herbivore.
consumer.
decomposer.
carnivore.
7. Which of the following is true of population cycles? (1 point)
Population cycles signal an imbalance in an ecosystem.
Keystone species are necessary to establish population cycles.
A new species introduced to an ecosystem tends to stabilize population cycles in the ecosystem.
Population cycling helps maintain a healthy ecosystem.
8. An example of a pioneer species is (1 point)
a sparrow.
a lichen.
an earthworm.
a spider.
9. Why are human disturbances often of more concern than natural disturbances? (1 point)
Human disturbances last much longer than natural disturbances so that a damaged ecosystem may have little or no chance of recovery.
Human disturbances are stronger than natural disturbances and so the recovery needed is much greater.
Human disturbances often cover much wider areas than natural disturbances, which means that more ecosystems are affected.
Human disturbances affect all types of ecosystems, whereas natural disturbances are limited to certain types of ecosystems.
10. Suppose a particular community is concerned about a fox population that kills and eats chickens on the local farms. What is the best course of action by this community? (1 point)
Kill the foxes.
Trap and transport the foxes out of the region.
Introduce rabbits as an alternative source of food for the foxes.
Build enclosures for the chickens that the foxes cannot access.

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