Answer:
The atmosphere is a closed system
Explanation:
Because inside the atmosphere open system
Answer:
calcium, iron, magnesium, potassium, chloride, zinc, sodium, sulfur
Explanation:
Jack. A signpost is a non-living thing and non living things do not grow. Sam is an adult and he has stopped growing already. Jack is a child and will continue growing the next few years.
49; Number of Electrons = Number of Protons = Atomic Number