The element boron, a trace element in Earth's crust, is found in foods produced from plants. Boron has only two
naturally occurring stable isotopes, boron-10 and boron-
11. Compare the abundance of the two naturally occurring
isotopes of boron.

The most efficient way to establish the best possible economizer position is to measure

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

At element makes up all organic compounds?