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A pesticide that kills an insect by interfering with the production of proteins in the insect would most directly affect the activity of
(1) ribosomes
(2) minerals
(3) chloroplasts
(4) mitochondria
When two different bird species temporarily occupy the same niche, they would most likely
(1) change their nesting behaviors
(2) not affect one another
(3) interbreed to form a new species (4) compete with one another
Which group would most likely be represented in a food chain?
(1) biotic factors
(2) abiotic factors
(3) inorganic compounds
(4) finite resources
Which statement describes a similarity between all enzymes, antibodies, and hormones?
(1) Their chemical structure is critical to their ability to function.
(2) Their ability to replicate identical copies ensures continuation of the species.
(3) They work better at 100°C than 37°C.
(4) They are made by and carried by the blood

A pesticide that kills an insect by interfering with the production of proteins in the insect would most directly affect the activity of
(1) ribosomes
(2) minerals
(3) chloroplasts
(4) mitochondria
When two different bird species temporarily occupy the same niche, they would most likely
(1) change their nesting behaviors
(2) not affect one another
(3) interbreed to form a new species (4) compete with one another
Which group would most likely be represented in a food chain?
(1) biotic factors
(2) abiotic factors
(3) inorganic compounds
(4) finite resources
Which statement describes a similarity between all enzymes, antibodies, and hormones?
(1) Their chemical structure is critical to their ability to function.
(2) Their ability to replicate identical copies ensures continuation of the species.
(3) They work better at 100°C than 37°C.
(4) They are made by and carried by the blood
Thank you SO much.

A pesticide that kills an insect by interfering with the production of proteins in the insect would most directly affect the activity of
(1) ribosomes
(2) minerals
(3) chloroplasts
(4) mitochondria
When two different bird species temporarily occupy the same niche, they would most likely
(1) change their nesting behaviors
(2) not affect one another
(3) interbreed to form a new species (4) compete with one another
Which group would most likely be represented in a food chain?
(1) biotic factors
(2) abiotic factors
(3) inorganic compounds
(4) finite resources
Which statement describes a similarity between all enzymes, antibodies, and hormones?
(1) Their chemical structure is critical to their ability to function.
(2) Their ability to replicate identical copies ensures continuation of the species.
(3) They work better at 100°C than 37°C.
(4) They are made by and carried by the blood
Thanks : )

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.

1. _____ is the number of organisms within the same species that inhabit a specific area. Population density Exponential growth
Population dispersion A limiting factor
2. What is a community? a group of different species that inhabit the same environment a group of organisms that are of the same species and share a habitat
the species, abiotic factors, and biotic factors that inhabit the same environment the abiotic factors of a habitat
3. When one organism hunts another organism, what type of relationship exists? symbiotic predation
mutualism commensalism
4. _____ are organisms moved from their native environment to a new, nonnative habitat. Niches Parasites
Introduced species Communities
5. Even, random, and clumped all describe types of _____? exponential growth population density
population dispersion limiting factors
6. Which of the following is NOT an example of a limiting factor? habitat space availability of food
outbreak of disease migration
7. What causes interspecies competition within a community? when two or more species compete for resources when a single species dominates the food supply
when two species have different dietary requirements when a single species requires a variety of food sources
8. If there has been a competitive exclusion within a community, what has occurred? A species that had previously competed for food has been eliminated from the community by a more efficient species. Limiting factors have decreased competition within the community.
The carrying capacity of the habitat has been reached. Two species that previously competed for food have begun to share the resources equally.
9. In which of the following relationships do both of the organisms involved benefit from one another? predation mutualism
commensalism parasitism
10. Which of the following factors influence the global distribution of ecosystems?
I. atmospheric circulation
II. oceanic circulation
III. land formations
IV. local environmental conditions
I and II I and III
I, II, and IV I, II, III, and IV
11. Before the 20th century, the growth of the human population was relatively _____. rapid slow
unstable exponential
12. No two species in a single community occupy the same _____. population ecosystem
niche habitat

2. What is the correct term for only the biotic factors in a tropical rain forest?
community
habitat
ecosystem
niche