1.which of the following has genetic engineering been used to do? a) make plants easier to grow in low gravity b) make plants more resistant to pesticides & herbicides c) make plants more resistant to frost & drought d) make plants more resistant to disease e) make plants more nutritious for human consumption 2. genetically identical organisms derived from a single genetic source are called a. hybrids b. clones c. siblings d. variants

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:

answer: that would be cheating

explanation:

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.