Answer:
flagella
Explanation:
The plasma membrane of some cells have extensions that have other functions, such as flagella to help a single-celled organism move or cilia to help keep our airways clear.
The distance covered by PJ is 0.35mile and displacement is 0mile.
<h3><u>Explanation:</u></h3>
Distance is defined as the length of space between two points through the path taken by the point to move towards the other.
Displacement is defined as the length of straight line joining the two points.
So as PJ rides his bike around the sidewalks, he travels a particular distance with his bike which is measured to be 0.35mile.
But as PJ starts from his home and also ends at his home, so the length of space between the initial point and final point is nil. So displacement is 0 mile.
I guess it will be C: atoms and molecules because according to Jhon Dalton's
atomic theory :"all matter is made up of atoms"
and even if we think of other options think it by urself that not all matter is made up of them