Question

drag the right word to its definition
small in number or extent;
thinly scattered.
sparse
pedestrian
alternate

Explanation:

The definition "small in number or extent; thinly scattered" matches the word "sparse". "Pedestrian" relates to walking or ordinary, and "alternate" means to take turns or substitute, so they don't fit.

Answer:

The word that matches the definition "small in number or extent; thinly scattered" is "sparse". So drag "sparse" to the definition box.