The space between the arachnoid mater and the pia mater is the:

The type of blood that may be administered to all people in an emergency, regardless of their blood type, is:

A) O negative. B) AB positive. C) AB negative. D) O positive.

Dangerous organisms that can grow in a variety of environments and are capable of producing toxic substances are known as:

A) toxins. B) bacteria. C) viruses. D) biologicals.