Mushroom may be, didn't learn that it. Well, mushrooms' whole fungus is underground.
Answer:

Explanation:
Given:
mass of the boat, 
uniform speed of the boat, 
rate of accumulation of water mass in the boat, 
time of observation, 
The mass of the boat after the observed time:



<u>Now using the conservation of momentum:</u>



When you keep raisin in water and the raisin gets puffed.
Movement of salt-water in animal cell across our cell membrane.
The second major reason for the difference in gravity at differentlatitudes is that the Earth's equatorial bulge (itself also caused by centrifugalforce from rotation) causes objects at the Equator to be farther from the planet's centre than objects at the poles.
Answer:
Number of absent affects the grade
Explanation:
the dependent variable is the grade and the independent variable is the number of absent, since the grade depends of the number of absents.