What are characteristics of duckweed and watermeal?

B is the correct choice because duckweed and watermeal are both recognized for their unique characteristics as free-floating aquatic plants. They are among the smallest flowering plants in the world, with duckweed typically measuring just a few millimeters in size, while watermeal is even smaller, often appearing as tiny green specks on the water's surface. This size allows them to float freely, making them a significant component of many aquatic ecosystems.

Their abundance in still or slow-moving water bodies provides essential cover and habitat for various aquatic organisms. In contrast, the first option describes large plants that need flowing water, which does not accurately characterize duckweed or watermeal. The third option misrepresents these plants, as they do not have deep roots and are not adapted to thrive in strong currents; rather, they prefer calm waters. The last choice is incorrect as duckweed and watermeal are typically green, not bright pink, and although they can attract insects, they are not characterized by their color in this context.