If a hypothesis is supported by several expirements it may become

ANSWER:

If a hypothesis is supported by too many experiments, it may become a theory.

EXPLANATION:

Hypothesis is a supposition or proposed explanation for any investigation. Hypothesis is the starting point of any investigation.

When hypotheses need to be verified, experiments are conducted to either prove it to be true or false. When several experiments provide the hypotheses to be true, it becomes a theory. A theory is a generally or scientifically acceptable principle or fact.  

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

the answers are a and c