Question

1. energy and chemicals move through ecosystems in different ways. nutrients are constantly through the ecosystem, while energy moves through an ecosystem in ___ direction.

Explanation:

To solve this fill - in - the - blank question about ecosystems, we analyze the characteristics of energy and nutrient flow:

Step 1: Recall the flow of nutrients in an ecosystem

Nutrients in an ecosystem are recycled. For example, elements like carbon, nitrogen, and phosphorus are taken up by organisms, released back into the environment through processes such as decomposition, and then can be taken up by other organisms again. So nutrients are constantly "recycled" through the ecosystem.

Step 2: Recall the flow of energy in an ecosystem

Energy in an ecosystem comes from the sun (for most ecosystems). Producers (like plants) capture solar energy and convert it into chemical energy. Then, as energy moves from producers to primary consumers, secondary consumers, and so on, a large amount of energy is lost at each trophic level (usually as heat). This means that energy cannot be recycled and flows in a "one - way" direction through the ecosystem.

Answer:

Nutrients are constantly \boxed{recycled} through the ecosystem, while energy moves through an ecosystem in \boxed{one - way} direction.