There is no absolute reason as to how they survive besides organisms learning to adapt. In order to live in a polluted environment the animals have to survive and learn to adapt.
1) Producing more offspring at a time
2)Reproducing more often
3)Reproducing earlier in life
A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst.
12 grams equals to 12,000 mg.And the other answer let someone else answer it.
B. The sun. It is the closest star to Earth. The moon does not heat up the Earth like at all. The distant stars are too far away to have an effect. The hot lava is in the Earth so it doesn't affect the surface.