Answer:
1.Mercury, Venus, Earth and Mars
2.global warming and climate change; water pollution and ocean acidification; and loss of biodiversity.
3.
<span>All physical forms of water:solid, liquid, and gas on or near the earth's surface make up the HYDROSPHERE</span>
We can estimate the age of an open cluster of stars by examining (The turnoff point of the cluster)
the answer is Amin was a Ugandan dictator
