Answer:
1 and 4 are punctuated correctly
Answer:
at the top of the swing
Explanation:
Potential energy is greatest when it's at its highest point. I hope this helps!
The tundra is a harsh envioroment so only the toughest plants and animals can survive.
Answer:
I do not think aliens exist. The reason wgy is that every other planet doesn't have good living conditions, like no air, water, or crops. Also, there are very extreme tempatures depending on what planet you are on. Earth is the only place where it is actually cool and warm.
