I really need help with these marine science questions please

1: Most species of fish require dissolved oxygen for their metabolism. Why would these species tend to be found in shallow ocean zones?

A: There is more gas exchange in shallow ocean zones.
B: There is lower temperature in shallow ocean zones.
C: There is less pressure in shallow ocean zones.
D: There is less gas exchange at shallow ocean zones.

2: Cyanobacteria are organisms that use the sun's energy to produce their own food. During a storm, a population of cyanobacteria was carried down into a deeper layer of the ocean. Predict what would happen to this population.

A: It would thrive, because water currents would carry it farther from the shore.
B: It would thrive, because more nutrients are available deeper in the ocean.
C: It would die, because sunlight is unable to penetrate deep into the ocean.
D: It would die, because oxygen levels are higher in deep zones of the ocean.

3: A marine scientist observes that dissolved oxygen decreases with increasing ocean depth. He concludes that deep sea creatures must require less oxygen than those at shallower depths. Why is this an invalid scientific conclusion?

A: The data he collected were not compared to those collected at other sites.
B: The data he collected was inaccurate.
C: The data he collected was from a laboratory and not in natural conditions.
D: The data he collected was relative and not absolute.

4: How does the density of solid water (ice) affect aquatic life?

A: It allows ice to float to the top of water, allowing life to live below.
B: It allows ice to sink to the bottom of water, allowing life to live above.
C: It traps air within solid ice, allowing life to breathe within air pockets.
D: It produces bubbles as it freezes, allowing life to breathe under water.

#4 is A .Hydrogen bonds expand causing the molecules are father apart and trap air between them. In most substances, a liquid is more dense than a solid, but for water that's not the case. This affects marine life because it allows it to exist underwater when it is cold and ice forms

Answer Link

Arclight Arclight · Answer 2 · 2020-01-02T09:50:52+01:00

Answer:

1. A

2. C

3. B

4. A

Explanation:

1. The rate of gas exchange is higher at the shallow zones this is because the water in this zone has 100% saturated i.e it contains as many air molecules in water as in air. Therefore, species prefer to live in the shallow zone.

Hence, option A is correct

2. Cyanobacteria need sunlight for photosynthesis for producing food for itself and other organisms. Since sunlight cannot reach greater ocean depths, hence the cyanobacteria will not photosynthesize and die eventually.

Thus, option C is correct

3. At greater depths oxygen concentration increases, therefore there are high chances that a species which lives at greater depth may require higher percentage of oxygen. Since the observation of the scientist is exactly opposite to the established concept hence, he might be using wrong data set.

Option B is correct

4. During freezing temperatures, the water as ice floats on the top of the surface thereby allowing water below it to expand more than the normal scenario thereby entrapping more oxygen and hence allowing organisms to breathe. Thus, option A is correct