28) Which of the following is an advantage of using coal to generate electricity? A. Generating electricity this way does not produce heat or produce greenhouse gases
B. Coal is a renewable resource, so we will always have an adequate supply
C. Coal is extremely inexpensive to extract and convert into electricity
D. Mining coal does not disturb natural habitat at the surface

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:

weathering is the answer.

radon is correct hope this