I need help with marine science?

[dasco]

1.)Explain why mangroves are perfectly adapted to an estuarine habitat. Provide at least two (2) pieces of evidence to support your claim.







2. Coral reefs are usually found near the equator between the Tropic of Cancer and the Tropic of Capricorn. Which of the following best describes why this is an ideal location for coral?
cool water temperatures
a.)wave action
b.)plenty of sunshine
c.) changes in salinity


3. Certain corals have been found in extremely deep water. These coral lack the zooxanthellae that are found in tropical coral reefs. What is the most likely explanation for this?
a.) zooxanthellae cannot survive in cold water
b.) zooxanthellae cannot survive without sunlight
c.)zooxanthellae cannot survive without the coral polyps
d.) zooxanthellae cannot survive the high pressure of the deep ocean


4. Coral reefs face many threats. Destructive fishing is an example of a ________________ threat.
a.)chemical
b.) agricultural
c.)natural
d.)man-made


5. Which of the following is an example of a mollusk in class cephalopoda?
a.) slug
b.)oyster
c.)cuttlefish
d.)chiton


6. Which of the following best describes an estuary?
a.)partly enclosed area with saline water
b.) partly enclosed area with brackish water
c.)completely enclosed area with brackish water
d.)completely enclosed area with saline water


7. What do estuaries provide that best supports the statement "estuaries are highly polluted bodies of water"?
a.) homes to a large variety of flora and fauna
b.)buffer for inland flooding
c.)mixture of salt and freshwater
d.) filter to water flowing in and out of the area


8. Chephalopods are known for having highly developed nervous systems which includes a highly developed eye and the ability to change their coloration. Provide two ways that this is beneficial for organisms in this class.







9. Blue-green algae plays an important part in the nitrogen cycle by recycling ammonia into nitrates and by "fixing" elemental nitrogen into a form that can be used by organisms. A decrease in this alga would have a large negative impact on the marine environment. However, not all algae play the same role in the environment. Explain how a bloom (a drastic increase) of algae can cause problems in the marine environment.