PLEASE HELP: The summary fusion reaction in the Sun combines ___ hydrogen ions to produce helium nucleus (or nuclei) plus energy with two hydrogens being given back. First blank choices: Second blank choices:
2 1
3 2
4 3
5
6

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.