Before 120 years ago, the leading cause of death was pneumonia, and infections from other but Science has found cures or vaccinations for many of these conditions.

Sources is the answer. Hope it helps :)! Mark as brainliest

Explanation:

so we know the answer cannot be c because no insect or animal starts as an adult

the answer is a. a swimming larvae

because since they are sea animals they automatticaly have to know how to swim they cannot just sink to the bottom

sorry if this is the incorrect answer.