Question

is divided into two

categories: direct and indirect

direct cause is a

or a microorganism responsible for invading cells of the body and causing regular functions to be

indirect cause includes

factors, or any factor which makes an animal more

to a disease

pathogen

susceptible

predisposing

major

disturbed

Explanation:

1. The first blank refers to the broad classification of disease causes, which is "major" categories.
2. A direct cause that invades body cells and disrupts function is a "pathogen", and this invasion disturbs bodily functions, so the next blank is "disturbed".
3. Indirect causes are factors that increase vulnerability, called "predisposing" factors, which make an animal more "susceptible" to disease.

Answer:

• Is divided into two major categories: direct and indirect
• direct cause is a pathogen or a microorganism responsible for invading cells of the body and causing regular functions to be disturbed
• indirect cause includes predisposing factors, or any factor which makes an animal more susceptible to a disease