When is it necessary for a scientists to do research?

select all that apply.

a. before forming a hypothesis

b. only after a hypothesis is written

c. after generating an idea from an observation

d. when designing an experiment to test a hypothesis

A. before forming a hypothesis

C. after generating an idea from an observation

D. when designing an experiment to test a hypothesis

Explanation:

A. before forming a hypothesis: A background research of the previous research studies as well as the literature review is to be done before constructing a hypothesis.

C. after generating an idea from an observation:  After generating an idea from the observation other methodology should be implemented so as to rectified the fact that the observation is correct.

D. when designing an experiment to test a hypothesis: While implementing a suitable scientific methodology a research is required to be done so as test the hypothesis by an accurate and valid procedure.  

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but