Generally, substances in the solid state are more dense than their liquid states. However, water is an unusual exception and is
more dense than ice. Of course, water and it's unique properties are the main reasons for life on the planet.
How would the world be different if ice were more dense than water?
Snow would likely fall at different temperatures,
al marine life.
Ponds would probably freeze over in the winter and kill all mari
You could not keep drinks cold.
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Ice makers would no longer work correctly.
work correctly.

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong

answer; cnidarians;

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.