If aradio creates sound waves, then what creates sound waves? Answer choices: - a curling iron - energy - carpet - animals - dolphins - Gunshots - a couch - a radio
a radio

If testosterone causes the penis to develop, then what causes the penis to develop? Answer choices: - Creatine - Energy - Estrogen - Testicles - matter vibrating - Testosterone - movement - It expands
Testosterone

If plants will sleep in the short days of winter, then what causes plants to sleep? Answer choices: - winter - heat - lmestone - sweating - photons - Sun - Light - air cools
winter