Question

1. the author organized the different sections on microorganisms by —

a. describing how microorganisms can be hurtful and harmful.
b. explaining how microorganisms can cause diseases.
c. telling what happens when too many microorganisms are in one place.
d. sequencing the most harmful to the least harmful microbes.

Explanation:

To solve this, we analyze each option:

• Option A: If the author organized sections by describing both hurtful (harmful) aspects of microorganisms, this could be a broad organizational approach covering their negative impacts.
• Option B: Only explaining disease - causing is too narrow, as the question is about organizing sections on microorganisms generally, not just disease.
• Option C: Focusing on overcrowding is a specific scenario, not a general organizational method for sections on microorganisms.
• Option D: Sequencing by harm level is less likely as organizing sections usually isn't just about ranking harm, and the question implies a broader organizational theme.

So the most logical answer is A as it provides a broader way to organize sections on microorganisms by their harmful nature.

Answer:

A. Describing how microorganisms can be hurtful and harmful.