Which do you think would cause a more profound biological impact: (1) a deletion/insertion near the beginning of a gene, or (2) a deletion/insertion towards the end of a gene? Explain.

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:

"d.) carbon dioxide and hydrogen sulfide"

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.