PLS answer il give brainliest

A

Explanation:

I was wrong. The answer is A.

Biotic and nonliving.

Explanation:

A dying tree is considered biotic because it was once living. It would considered nonliving because now the tree is dead, and no longer produces oxygen.

hope this helps!

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.