Q: When do weather balloons return to earth? Choices: - when the air heats up - when the timer runs out - when the air cools - when it bursts A:
when it bursts

(Question)
Q: Amines are classified according to the number of carbon atoms bonded directly to what atom? Choices: - helium - oxygen - hydrogen - nitrogen A:
(Answer)
nitrogen

Ques: Q: Transport of water and solutes in plants water potential is a measure of the difference in potential energy between a water sample and this? Choices: - green water - dirty water - salty water - pure water A:
Ans: pure water

(Q).
Q: What current-carrying long coil of wire acts as a magnet? Choices: - converter - antenna - igniter - solenoid A:
(A).
solenoid

Ques:Q: Where does most of the mass for an atom reside? Choices: - electrons - neutrons - protons - nucleus A:

Ans:nucleus

Ques: Q: Hormones send what through your body? Choices: - nutrients - cells - proteins - signals A:
Ans:
signals