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Which best describes what is occurring in this population of squirrels?Number of Squirrels Entering and Leaving a Population after 1 YearCause of changeNumber of squirrelsDied from predation2Born4Immigration10Left to find food3Died from disease8Left to find a mate3

A
Population growth is decreasing.
B
Population growth is increasing.
C
Population growth stays the same.
D
Population reaches carrying capacity.
2
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Scientists use specific levels of organization to analyze the biosphere. The Everglades consist of a large area of subtropical wetlands in Florida. Various species of plants and animals can be found in the Everglades, including panthers, cypress trees, herons, and alligators.The group of ecosystems on Earth that feature climate, vegetation, and wildlife similar to the Everglades is

Question illustration
A
a biosphere.
B
a community.
C
a population.
D
a biome.
3

What is the difference between a community and a population?

A
A community has only one organism, while a population has many organisms.
B
A population has only one ecosystem, while a community has many ecosystems.
C
A community has only one biome, while a population has many biomes.
D
A population has only one species, while a community has many species.
4

Which molecule would be the most affected by limited nitrogen?

A
myofibrillar proteins in muscle
B
glucose molecules in starch
C
fat molecules surrounding organs
D
cellulose molecules in plant cell walls
5

A mountain lion population recently experienced a drop in population size. Which of the following would best describe the limiting factor that is involved?

A
A change occurred in the genetic variability.
B
The deer population experienced a rapid decline due to a parasite.
C
Mountain lion hunting experienced an increase in restrictions.
D
The population of Trichinella, a parasite, experienced a decline.
6

A group of environmentalists was discussing the benefits and drawbacks associated with using fossil fuels. Which argument best fits the conversation?

A
Fossil fuels are cheaper than alternative forms of energy.
B
Fossil fuel reserves will never be depleted.
C
Fossil fuels are easily renewed.
D
Fossil fuel use does not affect the environment.
7

Which sequence of processes transports water from the atmosphere to the ocean and then back into a cloud?

A
precipitation ® condensation ® transpiration
B
evaporation ® condensation ® sublimation
C
precipitation ® evaporation ® condensation
D
evaporation ® precipitation ® condensation
8

Ash trees are being removed when they show signs of the ash borer, a parasite that affects only ash trees and kills them off. What best explains why the ash trees are being cut down?

A
The ash borer is a density-independent limiting factor, and humans need to clear cut to control tree density.
B
The ash borer is a density-dependent limiting factor and will start to spread to nearby healthy trees.
C
Ash trees are outcompeting other trees and are thus more affected by the ash borer.
D
Changes in climate have decreased ash borer populations which indirectly increased the need for cutting down the trees.
9

Review the picture below.Which would be the most accurate title for this picture?

Question illustration
A
primary succession after a controlled fire
B
primary succession after a volcanic eruption
C
secondary succession after a controlled fire
D
secondary succession after a volcanic eruption
10

Which best protects animal species that are endangered due to overhunting?

A
laws
B
increased biodiversity
C
poaching
D
captive breeding
11

A trout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. If it continued to grow exponentially, approximately how many trout were there in 1995?

A
100
B
128
C
256
D
320
12

Scientists have a theory about the relationship between climate and biodiversity. Which best describes this theory?

A
Warmer climates promote higher biodiversity, allowing plants to grow year-round. This supports more organisms that rely on plants.
B
Colder climates promote higher biodiversity, reducing the competition among organisms for food. This supports stronger organisms that live longer.
C
Warmer climates promote higher biodiversity because they tend to receive more rainfall. This provides a source of water for more organisms.
D
Colder climates promote higher biodiversity because they are usually larger in size. This provides space for more organisms.
13

Which statement about water best illustrates the property of adhesion?

A
water droplet found on a spider web in the morning
B
water molecules in a drop of dew
C
water is necessary for animal respiration
D
water dissolving salt into a solution
14

A hunter illegally kills a wolf in Yellowstone National Park and attempts to bring the wolf's skull back to Florida. Which law is the hunter violating?

A
the National Park System Act
B
the Lacey Act
C
EPA
D
CITES
15

How would an increase in nest sites affect a population of pigeons?

A
The population would decrease.
B
The population would increase.
C
The population would remain almost the same.
D
The population would be reduced the next year.
16

Interactions between organisms and their environment impact the organism’s overall population. The jaguar Panthera onca is the largest cat in North America. It is found in areas across the Southwest, including Arizona, New Mexico, and Texas. It is a carnivore that has powerful jaws and sharp teeth and preys on fish, turtles, and many smaller mammals. Which shows the relationship between the jaguar and turtles?

A
adaptation principle
B
competitive exclusion principle
C
niche principle
D
predator-prey relationship
17

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?

A
produce brought from the eastern states
B
trapped in a ship's ballast or a water tank
C
trapped in a cargo crate carrying nonperishable items
D
luggage brought in an overseas flight
18

A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?

A
30 kJ
B
300 kJ
C
3,000 kJ
D
30,000 kJ
19

The map shows the distribution of wild boars in the United States (shaded area). Which of these facts about wild boars is best supported by the evidence provided?

Question illustration
A
Wild boars were brought to the United States by humans.
B
Wild boars have quickly spread through the United States.
C
Wild boars have established successfully mostly in areas with warm climates.
D
Wild boars have a high reproductive rate and no natural predators.
20

What would happen to the size of the carnivore population if the herbivore population increased?

A
decrease
B
increase
C
die off
D
stay the same

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