Select the correct statement or statements about compounds and molecules:

a. a compound is made of just one type of element

b. a molecule is two or more atoms bonded together

c. a molecule can be made of one type of element or a mixture of elements.

d. compounds don't act like their elements; compounds

I believe the answers are: B) A Molecule is two or more atoms bonded together and: D) Compounds don't act like other elements.

✰B.

✰ A molecule is two or more atoms bonded together

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:

true is the answer : )