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Science Question !!! PLEASE HELP?

1. Human activities that may have an indirect environmental impact on coral reefs include all of the following EXCEPT

A.Cruise ships

B.Marina operations

C. Scuba diving

D. Seafood consumption

2. When humans clear the trees and other plants from the soil, what is likely to happen to the top soil?

A. It is washed into the sea

B. It is left on the land for new plants to grow

C. It is moved to another location by humans

I think all 4 choices for #1 may have an indirect impact because:

Snorkeling, diving and boating can cause direct physical damage to reefs, and fishing and collecting can contribute to over-exploitation of reef species and threaten local survival of endangered species.

Physical damage from anchors and especially boat groundings can be severe. Anchor damage is proportional to the size of the boat (i.e. weight of the anchor and length of anchor chain) and is further dependent on the type of coral community. Recovery of coral damage from boat groundings is slow. Anchor damage can be avoided to a large extent by installing permanent moorings, designating anchorages and providing adequate information on anchoring and mooring.

Fishing contributes to over-exploitation of reef fish stocks. I am assuming that someone will eat whatever the fisherman catches. However, if I don't assume that, then D. seafood consumption would be my choice.

Marina operation adds pollution from inappropriate disposal of oils and paint residues. There is also pollution from fueling

2. A

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