Answer:
Mammals, Mollusks, Roundworms, Arthropods, Flatworms
Explanation:
Answer:
A hypothesis is a possible explanation for a set of observations or an answer to a scientific question. A hypothesis must be testable and measurable. This means that researchers must be able to carry out investi- gations and gather evidence that will either support or disprove the hypothesis.
Explanation:
If they have cell walls it will be hard for the material to get in and out of the cell resulting in cell death or damage
