Answer the following question given this paragraph: 

In science, we need to make observations on various phenomena to form and test hypotheses. Some phenomena can be found and studied in nature, but scientists often need to create an experiment . Experiments are tests under controlled conditions designed to demonstrate something scientists already know or to test something scientists wish to know. Experiments vary greatly in their goal and scale, but always rely on repeatable procedure and logical analysis of the results. The process of designing and performing experiments is a part of the scientific method.


Q: In science, we need to make observations on various phenomena to form and test what?

 Choices:

- assumptions

- theories

- variations

- hypotheses

A:
hypotheses
