True or False. Index Fossils are formed from organisms that were alive for short period of geologic time, are extinct, had hard parts, and lived across wide geographic area.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

One nanometer is equal to how many meters?

Why is the bottom layer of a trophic pyrimid the