Who started the website "pintrest"

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

If 10.5 l of a at 0.98to 1.50 , is ?

How many atomic mass units are equal to 1.672×10−24 g of protons?