Answer:
The changes which can be reversed are called reversible changes. These are also called physical changes. Example- Melting of ice, Tearing of paper etc are physical or reversible changes.
Explanation:
Answer:
Explanation:
The independent variable determines the value that needs to be calculated or the decision that needs to be made from the observations of the experiment. Hence, experimental design decision would most likely produce invalid and unreliable results when having more than one independent variable.
Answer:
D.
Explanation:
It will stay the same no matter how the atoms are rearranged
Answer: Farming
Explanation: Plowing the land is the first source of wealth.
Drinking water shortages? Water across the world isn't purified which without purification doesn't quench thirst.