Answer:
gravity
Explanation:
gravity is the reason why regular things can't float, why we land when we jump, and why we can't fly.
gravity pulls us towards the ground, towards the center of the earth (inner core)
Answer:
Rectus Femoris
Explanation:
It has an action of extending the knee from a seated position.
I hope this helps, and as always, I am joyous to assist anyone at any time.
