Several scientists make the same observation about the effect of sunlight on algae. This set of observations forms a ?

Several scientists make the same observations about the effect of sunlight on algae. This set of observation is called Working theory. ... The study of algae is called phycology or algology. The term shields a variety of photosynthetic creatures, and many are not narrowly related.

just go with your heart buddy

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.