Which of the following is not a reason that humans genetically engineer trees? a. insect resistance b. pharmaceutical production c. faster growth d. none of the above

d. none of the above

Genetic engineering is a field of biotechnology which involves the manipulation of the genome of the organism so as to make it disease free, and suitable for human use by improving the quality of the organism.

Humans genetically engineer trees so as to make them resistant against the insects, for pharmaceutical production and to enhance their growth faster. Therefore, all these reasons supports the use of genetic engineering for trees, hence none of the above is the correct option.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

b.have there own function.