Cyanobacteria have been engineered to produce isobutanol directly. what advantage does this have over other alternative biofuels?
a. it is an inherently renewable fuel source.
b. multiple processing steps can be avoided.
c. they produce chemical energy through photosynthesis.
d. they make a biofuel alternative to gasoline.

On edge.nuity the answer is B.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

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).