1. which microscope is used for determining the chemical identity of a substance?

2. a piece of physical evidence is fused with sodium metal to form a solution. a deep yellow precipitate is obtained when nitric acid and silver nitrate is added to the solution. which element does the physical evidence contain?
a.
carbon
b.
nitrogen
c.
iodine
d.
oxygen

class- forensic science

The answer is C for 2.

Explanation:

Got it right, lol.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).