What type of wave requires a medium to transfer energy?

a. electromagnetic
b. mechanical
c. light
d. radio

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction