The rock is heavy because the mass changes from 10.0kg to 100.0kg in 3.24 seconds
They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe.
If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.
Firstly they are not membranes and they are villi's which increase the surface area during digestion
<span>You would know you were in the troposphere if you see stuff like the clouds because it is earths lowest layer. </span>
