Question

use the descriptions about the tolerance of different aquatic species in the table to answer the question. water sample a contains only leeches. water sample b contains leeches and predacious diving beetle larvae. what comparison can be made between samples a and b? both samples came from the same water source. sample b has relatively poorer water quality than sample a. sample a has relatively poorer water quality than sample b. both samples a and b have the same water quality.

Explanation:

Tolerant species like leeches are in both samples. Sample B has a more tolerant - species (predacious diving beetle larvae) compared to just leeches in Sample A. Generally, the presence of more tolerant species indicates poorer water quality. So, sample A has relatively poorer water quality than sample B as it has only the highly tolerant leeches while sample B has both leeches and another tolerant species.

Answer:

Sample A has relatively poorer water quality than sample B.