Forests is a major part of the biodiversity, forests cover about 6% of the planet, but they harbor up to 90% of the world's terrestrial biodiversity. This biodiversity is irreplaceable, and also has important economic uses. However, forests continue to disappear at an alarming rate. I therefore believe if all rain forests are destroyed then it means about 90% of terrestrial biodiversity will be destroyed.
Answer:
Their genes are expressed differently.
Explanation:
Nerve cells and skin cells have the same genes, but the reason they're different is because of how those genes are expressed and used. Some genes may not be of importance of skin, but they might have an affect on the neural pathways.
The older the Earth's crust, the denser it is.
I think it's the Y chromosome
:)