A) The data to support his hypothesis, so he should investigate if the same change happens in the density of solid water.
Answer:
Explanation:
archaea:they live in water area and usually eat some plants
bacteria:the germs that are in the air
eukarya:it is an animal well better said any animal because it has a cell membrane and nucleus to protect the cell
So we can protect ourselves from the same virus if it attacks again in the future
