I donot know but i think it is white blood cell
The correct answer is letter a. the forces are equal and opposite.
A car's windshield has the same force of the car while it is moving, if a humming bird flies towards a moving vehicle without the bird getting hurt, the bird and the car may be considered to have equal yet opposite forces, which left the hummingbird unharmed.
One way to remove dirt and harmful substances from water is by filtering.
Answer: I think it’s B).
Explanation: since that doesn’t require water being brought from a different location.
