Cell, and gas are for sure made up of atoms so it’s either heat or a solid
Answer:
This is an example of biotechnology because it seeks to solve a societal problem using biological entities.
Flatworms are unsegmented worms. They have a tail and a head end by don't have any body cavity or specialized respiratory and circulatory organs. They are also bilaterally symmetrical which gives them both upper and lower surface. With this accompanying characteristics they typically have a flat shape or appearance.