What is the electron configuration of an element with atomic number 20? A. 1s2 2s2 2p6 3s2 3p5 B. 1s2 2s2 2p6 3s2 3p6 C. 1s2 2s2 2p6 3s2 D. 1s2 2s2 2p6 3s2 3p6 4s2 E. 1s2 2s2 2p6

What effect does medical advances have on population growth A. medical advances could lead to a decrease in both death and birth rates B. medical advances could lead to a decrease in both death and growth rates C.

Name two properties of ocean water affected by depth. how does depth affect each?

What is the energy transformation taking place as a moving roller coaster slowly climbs a steep hill? Potential energy to kinetic energy Kinetic energy to potential energy Radiant energy to chemical energy Chemical energy to radiant energy

Which organism has a better chance of leaving a fossil a jellyfish or a bony fish?

which substance may lower air temperatures after a volcanic eruption? lava sulfur dioxide carbon dioxide water vapor

The rapid depolarization phase of the action potentials of myocardial contractile cells is due primarily to which ion (s) ?

Echinoderm reproduction typically is a. sexual reproduction by budding. b. sexual reproduction with internal fertilization. c. by regeneraton. d. sexual reproduction with external fertilization.

Which is an abiotic factor of the boomslang's environment? A. the sun B. the tree C. the grass D. the people

A double-stranded molecule of DNA has 80 T nucleotides and 110 G nucleotides. What is the TOTAL number of nucleotides in this molecule of DNA?

Why is an angioplasty an incorrect treatment for an aneurysm? A) Aneurysms cannot be treated. B) An angioplasty may rupture the blood vessel wall. C) An angioplasty can have dangerous drug reactions. D) Aneurysms are treated only with pacemakers.