Question 19 What is an advantage of a nuclear-fission reactor?
А
The nuclear waste generated has a very long half-life.
B
The products of fission reactions are often radioactive isotopes.
С
The power plants are only expensive if they require radiation shielding.
D
A large amount of energy can be produced from a small amount of uranium.

what subject is this

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

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).