Question

the movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer. you have been asked to write an essay about the layers of a rainforest ecosystem. which of these is the most effective topic sentence for a paragraph in this essay? rainforests are one of earths most precious ecosystems. the emergent layer of the rainforest ecosystem gets the most sunlight. there are four layers in a rainforest ecosystem: emergent, canopy, understory, and forest floor. the rainforest is full of life at every layer of its ecosystem.

Explanation:

The task is to write about rainforest ecosystem layers. A good topic - sentence for a paragraph should focus on a specific layer or aspect of the layers. The first option is too general about rainforests. The third option is more of an introduction to the layers rather than a topic - sentence for a single paragraph. The fourth option is also rather general about life in all layers. The second option, "The emergent layer of the rainforest ecosystem gets the most sunlight", focuses on a specific layer (the emergent layer) and provides a specific fact about it, making it a good topic - sentence for a paragraph.

Answer:

B. The emergent layer of the rainforest ecosystem gets the most sunlight.