Do echinoderms have heads or faces ?

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.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Why does asexual reproduction result in offspring with identicle genetic variation