Question

Write two examples for each of the following.
1. Rough materials.
2. Unicellular organisms
3. Reversible changes.
4. Scavengers
5. Rectilinear motion.​

Answer 1

Answer:

rough material-cement sand paper

unicellular organisms - bacteria and protozoa

reversible changes - melting of candel and freezing of ice and then melting.

scarvangers- raccoon and coyote

rectilinear motion - The use of elevators in public places is an example of rectilinear motion.

Gravitational forces acting on objects resulting in free fall is an example of rectilinear motion