Is the answer b or no which gas makes up 78% of earths atmosphere? a. methane. b. nitrogen. c. oxygen. d. carbon dioxide.

All motion is caused by force? true or false

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume

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