Question

1. 1. an illness that affects a person, animal, or plant?

d. virus

b. disease

a. disorder

c. infection

Explanation:

To solve this, we analyze each option:

• "Virus" (d) is a pathogen, not the illness itself.
• "Disease" (b) is defined as an illness affecting people, animals, or plants.
• "Disorder" (a) often refers to a disruption of normal function, not as general as "disease" for this definition.
• "Infection" (c) is the process of being invaded by pathogens, not the illness.

So "Disease" matches the definition.

Answer:

b. Disease