Answer:
D. must have a moon
Explanation:
Scientists say that a planet must orbit a star, must be round, and must be big enough so its gravity clears its orbit of other objects. Therefore, the statement that is not a requirement for a planet is
D. must have a moon
For example, Mercury and Venus are planets with no moons.
Answer:
An electric motor converts electrical energy into mechanical energy. The process is as follows:
D. When current flows through the motor, it powers electromagnets that are attracted and repelled by the poles of permanent magnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the mechanical energy available.
The correct answer is the energy of the sun
Answer:
c
Explanation:
protons are the postive charge in your nucleus in the cell
Answer:
examples of mixture: smoke,fog,sand, potassium nitrate, sulfur and carbon.
examples of compounds: mithane, ammonia,salt and nitrous oxide.
examples of elements: hydrogen , helium, oxygen and neon.
Explanation:
there are more elements
