Biology

The correct answer is: B.algae.

Algae are typically the first organisms to appear in a pond or lake. They are well-adapted to colonize aquatic environments quickly, often thriving in nutrient-rich conditions. Algae can grow in a variety of forms, from microscopic phytoplankton to larger macroscopic species like seaweeds.

Here’s why the other options are less likely to appear first:

A.Grass: Grass generally requires land environments and would not grow submerged in a pond or lake.