Some Aquatic Invertebrates Such as Insects and Snails Feed on Biofilms

question 58

Multiple Choice

Some aquatic invertebrates such as insects and snails feed on biofilms. Scientists that study metal-contaminated streams have documented that some biofilms in stream environments absorb zinc from stream water during daylight hours and release the zinc into the stream during the night. If the scientists were to test exposure of the invertebrates to zinc, what might they hypothesize?

• A)The greatest exposure to aquatic invertebrates that feed on biofilms might only occur during daylight hours.
• B)The greatest exposure to aquatic invertebrates that feed on biofilms might only occur during night hours.
• C)Aquatic invertebrates that prefer to feed at night will encounter little exposure to zinc.

---

Definitions:

Soil-Testing Laboratory

A specialized facility that analyzes soil samples to determine nutrient content, composition, and other characteristics important for agriculture and environmental science.

Inorganic Mineral Particles

Solid, naturally occurring substances that are not derived from living organisms, commonly found in soils and rocks, essential for various environmental and biological processes.

Organic Material

Matter that comes from living organisms or is composed of compounds originally synthesized by living organisms, often rich in carbon.

Micronutrient

An essential element that is required in trace amounts for normal growth. Compare with macronutrient.