Question

the germ theory of disease states that: a. macroorganisms can invade microorganisms and cause disease b. microorganisms can invade macroorganisms and cause disease c. cells are the fundamental units of life d. one infectious agent causes one disease e. inadequate washing can cause disease to be transmitted from one individual to a new individual

Explanation:

The germ - theory of disease states that microorganisms (germs) such as bacteria, viruses, fungi, etc. can invade macroorganisms (hosts) and cause disease. Option B correctly reflects this concept. Option A is incorrect as macroorganisms do not invade microorganisms to cause disease in the context of germ - theory. Option C is about cell theory, not germ - theory. Option D is about a single infectious agent causing a single disease which is more related to Koch's postulates rather than the general germ - theory. Option E is about disease transmission related to hygiene, not the core of germ - theory.

Answer:

B. Microorganisms can invade macroorganisms and cause disease