Answer:
Argon
Explanation:
The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table. destinymitchell966
Answer:
true
Explanation:
while it may stay inactive, it will stay in the body for many years
No caffein,there is a factor that must not be changed when conducting an experiment,known as controlled variable
I think they discovered chromosomes in DNA so that backed up his Idea
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Answer:
Humans have breached this cycle by digging up fossil fuels and burning them, leading to carbon dioxide building up in the atmosphere faster than natural systems can soak it up. This has led to a net increase in greenhouse gases in the atmosphere, causing the planet to heat up.
Explanation: