Final Answer:
When you are looking at this, you can see that there are tiny rocks. The tiny rocks are the ones that are light brown and dark brown. But the black things floating around the river are a. Leaves and debris. (Option a)
Step-by-step explanation:
When observing the river with light brown and dark brown tiny rocks, the black things floating around are likely leaves and debris. Leaves from nearby trees or plants can fall into the river, and other debris such as twigs or small branches may be carried by the water's current. These elements contribute to the variety of materials visible on the surface of the river.
Leaves and debris are common components found in natural water bodies, and rivers, in particular, can transport organic matter and other particles downstream. The movement of water can cause these materials to float and create dynamic patterns on the surface. While fish, shadows, and insects may also be present in or near the river, the description of black things floating around is indicative of leaves and debris. Understanding the various elements in a river ecosystem contributes to a broader appreciation of the environment and its ecological dynamics.
In summary, the presence of tiny rocks, light brown and dark brown, combined with the description of black things floating, suggests the inclusion of leaves and debris in the river scene. This observation reflects the complex and interconnected nature of natural environments, where different elements coexist and contribute to the overall balance of ecosystems.(Option a)