1
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Marine Science Final Exam 2025 (Actual
Exam) | Complete Questions and Correct
Answers | Graded A+ | Verified Answers
| Brand New Version! Questions and
Answers (100% Correct Answers) Already
Graded A+
Which of the following conditions is necessary for natural selection
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to occur? [ANS:] More organisms are born than can survive.
The average female cod produces two million eggs in a single
spawning; however, only about 200 of the original two million cod
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survive to age one. When cod reach their reproductive age of
two to four years, only two of the original two million are still alive.
What can you conclude about the traits of the two cod that
survived? [ANS:] These two fish have strong selective pressure.
In 1989, the Exxon Valdez spilled nearly 42,000,000 liters of oil into
Prince William Sound, Alaska. How would this spill be classified?
[ANS:] Abiotic environmental
Which of the definitions below best defines biomagnification?
[ANS:] A substance that increases in concentration with trophic
level
The following map of the Gulf of Mexico shows reported sightings
of whale sharks. What explanation best describes why the highest
reported sightings occur near the mouth of the Mississippi River?
[ANS:] Whale sharks are filter feeders, and this area is rich in
plankton due to runoff.
, 2
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Why are shellfish populations often a good indicator of water
quality? [ANS:] Many shellfish are filter feeders that absorb toxins
from the water.
Which statement best describes how pollution can impact the
apex predators of the marine community? [ANS:] The apex
predators are impacted by pollution in the environment because
they are the top of the marine food chain, where accumulation of
pollution is quite great.
A marine biologist explains that the salmon adapts to its
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environment through descent with modification. What is "descent
with modification"? [ANS:] A heritable trait can cause one
generation to be slightly different from another.
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In the Galapagos islands, larger iguanas are more successful at
reproducing and have more offspring. How would the population
change if larger body size also makes iguanas more vulnerable to
predatory birds? [ANS:] The population would be more balanced
between small, medium, and large body sizes because while
larger iguanas reproduce more, smaller iguanas avoid predators
better.
What is overproduction? [ANS:] The species produces more young
than can be supported by the ecosystem.
What animals would you likely find in this habitat?
swamp with lots of trees [ANS:] Juvenile fish and shrimp
What prediction can be made about how the distribution of coral
reef populations would be affected if the oceans in which they
live were to experience significantly more cloudiness of the water?
, 3
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he coral population would decrease due to lack of sunlight.
[ANS:] The coral population would decrease due to lack of
sunlight.
The average female Atlantic cod (Gadus morhua) produces two
million eggs in a single spawning. How does this relate to natural
selection? [ANS:] More organisms are born than can survive.
In sea horses, the female inseminates the male by inserting her
oviduct into the male brooding pouch several times to ensure
fertilization. After fertilization is complete, the female departs and
© 2025 Assignment Expert
the male attaches himself to a nearby object, and waits for the
eggs to mature. How would this reproductive strategy ensure
survival of the species? [ANS:] By protecting the fertilized eggs
from predators
Guru01 - Stuvia
The shells of some marine snails are highly variable, with some snail
shells being solid colors and others having stripes. Predation by
birds is a major source of mortality for the snails. Scientists studying
these snails found that while 47 percent of the snail population
was striped, 56 percent of the snails eaten by birds were striped.
What could scientists conclude about the snails? [ANS:] Solid shell
snail genes will increase in the population.
The flesh-eating bacteria, Vibrio vulnificus, destroys healthy tissue.
Infectious agents such as this are best classified as what kind of
environmental factor? [ANS:] Pathogenic
Between 1932 and 1968, a chemical factory in Japan released
mercury-laden wastewater into Minamata Bay. The mercury was
modified to methylmercury by bacteria living in bottom sediments.
This resulted in severe mercury poisoning in over 2,000 people.
Since people don't eat bottom sediments, what is the best
explanation for how toxic levels of mercury ended up in affected
people? [ANS:] Mercury accumulated in higher concentrations as
For Expert help and assignment solutions, +254707240657
Marine Science Final Exam 2025 (Actual
Exam) | Complete Questions and Correct
Answers | Graded A+ | Verified Answers
| Brand New Version! Questions and
Answers (100% Correct Answers) Already
Graded A+
Which of the following conditions is necessary for natural selection
© 2025 Assignment Expert
to occur? [ANS:] More organisms are born than can survive.
The average female cod produces two million eggs in a single
spawning; however, only about 200 of the original two million cod
Guru01 - Stuvia
survive to age one. When cod reach their reproductive age of
two to four years, only two of the original two million are still alive.
What can you conclude about the traits of the two cod that
survived? [ANS:] These two fish have strong selective pressure.
In 1989, the Exxon Valdez spilled nearly 42,000,000 liters of oil into
Prince William Sound, Alaska. How would this spill be classified?
[ANS:] Abiotic environmental
Which of the definitions below best defines biomagnification?
[ANS:] A substance that increases in concentration with trophic
level
The following map of the Gulf of Mexico shows reported sightings
of whale sharks. What explanation best describes why the highest
reported sightings occur near the mouth of the Mississippi River?
[ANS:] Whale sharks are filter feeders, and this area is rich in
plankton due to runoff.
, 2
For Expert help and assignment solutions, +254707240657
Why are shellfish populations often a good indicator of water
quality? [ANS:] Many shellfish are filter feeders that absorb toxins
from the water.
Which statement best describes how pollution can impact the
apex predators of the marine community? [ANS:] The apex
predators are impacted by pollution in the environment because
they are the top of the marine food chain, where accumulation of
pollution is quite great.
A marine biologist explains that the salmon adapts to its
© 2025 Assignment Expert
environment through descent with modification. What is "descent
with modification"? [ANS:] A heritable trait can cause one
generation to be slightly different from another.
Guru01 - Stuvia
In the Galapagos islands, larger iguanas are more successful at
reproducing and have more offspring. How would the population
change if larger body size also makes iguanas more vulnerable to
predatory birds? [ANS:] The population would be more balanced
between small, medium, and large body sizes because while
larger iguanas reproduce more, smaller iguanas avoid predators
better.
What is overproduction? [ANS:] The species produces more young
than can be supported by the ecosystem.
What animals would you likely find in this habitat?
swamp with lots of trees [ANS:] Juvenile fish and shrimp
What prediction can be made about how the distribution of coral
reef populations would be affected if the oceans in which they
live were to experience significantly more cloudiness of the water?
, 3
For Expert help and assignment solutions, +254707240657
he coral population would decrease due to lack of sunlight.
[ANS:] The coral population would decrease due to lack of
sunlight.
The average female Atlantic cod (Gadus morhua) produces two
million eggs in a single spawning. How does this relate to natural
selection? [ANS:] More organisms are born than can survive.
In sea horses, the female inseminates the male by inserting her
oviduct into the male brooding pouch several times to ensure
fertilization. After fertilization is complete, the female departs and
© 2025 Assignment Expert
the male attaches himself to a nearby object, and waits for the
eggs to mature. How would this reproductive strategy ensure
survival of the species? [ANS:] By protecting the fertilized eggs
from predators
Guru01 - Stuvia
The shells of some marine snails are highly variable, with some snail
shells being solid colors and others having stripes. Predation by
birds is a major source of mortality for the snails. Scientists studying
these snails found that while 47 percent of the snail population
was striped, 56 percent of the snails eaten by birds were striped.
What could scientists conclude about the snails? [ANS:] Solid shell
snail genes will increase in the population.
The flesh-eating bacteria, Vibrio vulnificus, destroys healthy tissue.
Infectious agents such as this are best classified as what kind of
environmental factor? [ANS:] Pathogenic
Between 1932 and 1968, a chemical factory in Japan released
mercury-laden wastewater into Minamata Bay. The mercury was
modified to methylmercury by bacteria living in bottom sediments.
This resulted in severe mercury poisoning in over 2,000 people.
Since people don't eat bottom sediments, what is the best
explanation for how toxic levels of mercury ended up in affected
people? [ANS:] Mercury accumulated in higher concentrations as
