Btw there was not a science category so i picked biology.

as a seedling's roots begin to grow into the mud, they displace the soil particles, which are moved aside to make room for the new tree.

a. first law of motion

b. second law of motion

c. third law of motion

d. friction

and

occasionally, another branch or leaf will rub against a seedling due to wind or water action, and cause it to fall prematurely.

a. first law of motion

b. second law of motion

c. third law of motion

d. friction

and
the drifting propagule tends to stay in motion. it will only get stuck in the mud and start to take root when it is really time to germinate.

a. first law of motion

b. second law of motion

c. third law of motion

d. friction