The following information is known to be true: All seadolls are birds. Seadolls nest on small rocky islands with other bird species. Some birds on these sites are greyish. Seadolls' nesting habits are influenced by the fear of predators. Some predators can swim or attack from the air. Based on the information given above, which of the following conclusions must be true? Choose the correct alternative. Some greyish birds are seadolls. All seadolls are greyish. Some seadolls are greyish. All greyish birds are seadolls. None of the conclusions above are necessarily true. I will leave this question unanswered