Final answer:
The correct answer is C. Log, Dead Grass, Fungi, Bird, as these are all biotic parts of an ecosystem, either being living organisms or remains of living things.
Step-by-step explanation:
The student's question is: "Which of the following lists include only biotic parts of an ecosystem?" Biotic factors are the living aspects of the environment, which include living organisms or remains of living organisms. Therefore, from the provided options, C. Log, Dead Grass, Fungi, Bird is the correct list that includes only biotic parts. Here's why:
- Logs may not be alive, but they are the remains of trees, which are living organisms.
- Dead grass is similar; it was once alive and is considered a biotic component.
- Fungi are living organisms, so they are biotic.
- Birds are clearly living organisms and hence a biotic factor.
Options A, B, and D contain abiotic factors such as rain, sand, and minerals, which are nonliving components of the ecosystem.