Final answer:
The word most similar in meaning to 'endeavors' is 'attempts'. In the context of a hypothesis, the term closest in meaning would be 'suggestion' as it is a proposed explanation requiring further investigation.
Step-by-step explanation:
The word endeavors is most similar in meaning to attempts. When you endeavor to do something, you are attempting to achieve or accomplish it. Therefore, the correct answer to the question about which word has a meaning most similar to endeavors is 'D. attempts'.
Regarding the similarity to 'hypothesis', the closest meaning would be suggestion. A hypothesis is a proposed explanation for a phenomenon, a starting point for further investigation. It is not yet confirmed as a fact, and therefore less definitive than a law or formula, and not a conclusion as it is the starting point and not the end of a scientific investigation. Hence, the most appropriate choice would be 'd. suggestion'.