Petroleum is a
resource.
a) reusable
b) recyclable
c) renewable
d) nonrenewable

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:

preservation because he preserves part of the land and preserves means save

explanation:

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.