Which is the formula for diarsenic pentoxide?

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What effect might melting sea ice have for people who live in coastal areas?