Calculate the electronegativity difference of the elements in H20. Show your work.

Which states of matter have particles that move independently of one another with very little attraction?

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?