Atestable explanation that's supported or refuted is called a/an. a. variability.. b. hypothesis.. c. reaction.. d. experiment.

B.a hypothesis "based on my research" a hypothesis is based on some previous observation such as noticing that in November many trees undergo colour changes in their leaves and the average daily temperatures are dropping. Are these two events connected? How? Any laboratory procedure you follow without a hypothesis is really not an experiment. It is just an exercise or demonstration of what is already known.

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !

Enzyme. anything that ends in "ase" is usually an enzyme.