The difference between a community and population is(1 point)

Question

Responses

populations refer to multiple species while community refers to living and non-living things
populations refer to multiple species while community refers to living and non-living things

populations refer to multiple species at the same time while community refers to a single species
populations refer to multiple species at the same time while community refers to a single species

populations refer to living things while community refers to living and non-living things
populations refer to living things while community refers to living and non-living things

populations refer to one species while community refers to all living species in an area

Answer 1

The correct response is: populations refer to one species while community refers to all living species in an area.

In ecology, a population consists of individuals of the same species living in a given area, while a community is made up of different populations of various species that interact with one another in a specific environment.

Answer 2

A population of mosquito larvae is living in a large pond. Mosquitofish are a type of fish that eat mosquito larvae. Which of the following describes a direct effect on the population of mosquito larvae when mosquitofish are introduced to the pond?(1 point)
Responses

births decrease
births decrease

emigration increases
emigration increases

deaths increase
deaths increase

immigration decreases

Answer 3

The correct response is: deaths increase.

When mosquitofish are introduced to the pond, their predation on the mosquito larvae would lead to an increase in the number of deaths among the mosquito larvae population.

Answer 4

The cardinal is a type of bird. Which of the following would increase the size of a population of cardinals in a forest?(1 point)
Responses

an increase in the birth rate of cardinals
an increase in the birth rate of cardinals

increased immigration of cardinal predators into the forest ecosystem
increased immigration of cardinal predators into the forest ecosystem

an increase in the death rate of cardinals
an increase in the death rate of cardinals

increased emigration of young cardinals from the forest ecosystem

Answer 5

The correct response is: an increase in the birth rate of cardinals.

An increase in the birth rate would lead to more cardinals being born, thus increasing the overall population size of cardinals in the forest. The other options would either decrease the population or have no positive effect on it.

Answer 6

The green sea turtle is an endangered species. The graph below shows the estimated number of green sea turtle nests on a beach in Costa Rica between 1970 and 2003. Which of the following could explain the change in the graph.

(1 point)
Responses

Humans passed laws protecting animals that eat green sea turtle eggs.
Humans passed laws protecting animals that eat green sea turtle eggs.

Humans collected more green sea turtle eggs for scientists to study.
Humans collected more green sea turtle eggs for scientists to study.

Humans built more hotels on the beach where green sea turtles build nests.
Humans built more hotels on the beach where green sea turtles build nests.

Humans passed laws preventing the collection of green sea turtles.

Answer 7

The correct response is: Humans passed laws preventing the collection of green sea turtles.

This action would likely contribute to an increase in the number of green sea turtle nests, as protecting the turtles from being collected would help their population recover, leading to more nesting activity. The other options either would not have a positive impact on nest numbers or could potentially harm the green sea turtle population.

Answer 8

Refer to the chart below. Determine if there will be an increase or decrease in population size. Choose one answer per row.

Natality

Mortality

Immigration

Emigration



(4 points)
Increase Decrease

Natality(birth) = 1

Mortality(death) = 2

Immigration(join a population) = 3

Emigration(leaving a population) = 4

Question 6
Read the following word problem to determine population change to answer the following question: There is a population of 100 horses on an island. Over the course of a year 10 horses were born, 5 horses passed away, 10 horses emigrated from the island and 5 horses immigrated to the island. What is the new population at the end of the year?(1 point)
Responses

The population would 110 because the net change is plus ten
The population would 110 because the net change is plus ten

The population would 90 because the net change is minus ten
The population would 90 because the net change is minus ten

The population would still be 100 because the net change is zero
The population would still be 100 because the net change is zero

You cannot determine the new population based on the information given

Answer 9

For the first part regarding population size changes:

• Natality (birth): Increase (1)
• Mortality (death): Decrease (2)
• Immigration (join a population): Increase (3)
• Emigration (leaving a population): Decrease (4)

For the second part regarding the population change of horses:

Initial population = 100
Horses born = +10
Horses passed away = -5
Horses emigrated = -10
Horses immigrated = +5

Net change = (10 - 5 - 10 + 5) = 0

Final population = 100 + 0 = 100

So, the correct answer is: The population would still be 100 because the net change is zero.

Answer 10

The image above shows just some of the impacts that humans have on ecosystems. How do these actions affect biodiversity?

(1 point)
Responses

Biodiversity is increased due to the additional resources humans provide
Biodiversity is increased due to the additional resources humans provide

Biodiversity is increased by the creation of new ecological niches that come with manmade habitats
Biodiversity is increased by the creation of new ecological niches that come with manmade habitats

Biodiversity is decreased due to the damage that humans cause to natural habitats.
Biodiversity is decreased due to the damage that humans cause to natural habitats.

Biodiversity is decreased due to the people putting animals in zoos.

Answer 11

The correct response is: Biodiversity is decreased due to the damage that humans cause to natural habitats.

Human actions often lead to habitat destruction, pollution, and other negative impacts that can reduce biodiversity in ecosystems. While humans can create new niches or resources, these typically do not compensate for the loss of natural habitats and species diversity.