Which best compares mutualism, parasitism, and commensalism between two organisms? both organisms benefit in mutualism and parasitism, but only one benefits in commensalism. both organisms benefit in mutualism, only one benefits in parasitism, and none benefits in commensalism. both organisms benefit in mutualism and commensalism, but only one benefits in parasitism. both organisms benefit in mutualism, but only one in parasitism and commensalism.

The answer is D. It is D because if you simply look at the definitions of each term it is clear:
Mutualism: Key word is mutual. Both organisms benefit. 
Parasitism: Key word is parasite. Only one organism benefits from it while the other organism is harmed. 
Commensalism: I can't really find a keyword for this. But one organism benefits while the other organism is not benefited or harmed. 

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Both organisms benefit in mutalism, but only one in parasitism and commensalism.

I really Hope This Helped You, Good Luck With Your Studies! =)

This is s cute awee : (( . well if she's showing you signs that she may like you , then shoot your shot ! don't be afraid . & if you're unsure that she's giving you these signs , then wait out for a little bit . most girls are different . some may act really sweet , but only bc you're a good friend of hers . that , or she might like you . you just never know . but i think you should sit down with her & tell her how you feel . but don't be awkward & shy . just be straight up & tell her how you feel . if the feelings aren't mutual , then don't cry about it . you need to respect her decision & look for others in the world . feelings can be difficult & confusing , but don't be afraid to show them . i say you play it out & if you're still unsure about it , talk to her . - rach

The open ocean begins at the low-tide mark and extends to the end of the continental shelf

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.