Based on the article which tissue do you think is affected by polio

Polio affects the body by attacking your central nervous system,

It infects the spinal cord, brain, and surrounding tissues.

some symptoms can be  depending on which area of the spinal cord and brain it attacks.

it happens because of  poor hygiene.

hope this helps :)

(( what article were you given because i cant answer the question directly if you dont give any context  ))

b. to discover aspects of the natural world.

hopefully i .

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).