What period of the mesozoic era did dinosaurs first appear

What appears to happen to the moon as it goes through the cucle

To what family of the periodic table does this new element probably belong

Dalton's atomic theory included which idea?

Define a compound and a mixture. Explain how they are different.

Which of earth's systems was most affected by fossilized dinosaurs? A. Biosphere B. Hydrosphere C. Lithosphere D. Atmosphere

Which can associate a suspect's gun with a crime?

In which era did the first fish appear? a. Carboniferous b. Paleozoic C. Mesozoic d. Permian

How are electrons excited and what happens when the electrons relax

What is the molarity of a solution that is made by dissolving 3.68 g of sucrose (c12h22o11) in sufficient water to form 275.0 ml of solution?

A straight line on a speed-time graph means the speed is constant. this means the speed is not changing over time. how is this different from a distance from a distance-time graph?