Question

how is a human infected with influenza different from a tick spreading rocky mountain spotted fever?
a. the human is a vector, and the tick is a parasite.

b. the human is a carrier, and the tick is a vector.

c. the human is a vector, and the tick is a carrier.

d. there is no difference in how the diseases spread; both are vectors.

Explanation:

To solve this, we analyze the terms: A carrier (like an infected human with influenza) harbors a pathogen and can spread it, while a vector (like a tick for Rocky Mountain spotted fever) is an organism that transmits a pathogen from one host to another. Option A is wrong (human isn't a vector, tick isn't a parasite in this context). Option C swaps the terms. Option D is wrong as they aren't both vectors. Option B correctly identifies the human as a carrier and the tick as a vector.

Answer:

B. The human is a carrier, and the tick is a vector.