Question

contagious means _______.

○ a disease is deadly.

○ a disease is harmless.

○ a disease can only exist in one species.

○ a disease can be passed to others easily.

Explanation:

To determine the meaning of "contagious", we analyze each option:

• "A disease is deadly" refers to lethality, not contagiousness.
• "A disease is harmless" is about the lack of harm, not transmission.
• "A disease can only exist in one species" relates to host specificity, not contagiousness.
• "A disease can be passed to others easily" matches the definition of contagious (easily transmitted from person to person or organism to organism).

Answer:

D. a disease can be passed to others easily. (Note: Assuming the last option is labeled D; if the original options had labels like A, B, C, D, adjust the identifier accordingly. Since the last option is the correct one based on the definition, the answer is the option stating "a disease can be passed to others easily".)