Question

Phytoplankton can float because their cells contain this molecule.

Answer 1

Phytoplankton can float primarily because their cells contain **chloroplasts**, which are organelles that house chlorophyll and other pigments involved in photosynthesis. However, the specific molecule that contributes to buoyancy in some phytoplankton species is **buoyancy vesicles** or **lipid bodies**. Additionally, some phytoplankton have gas-filled structures called **gas vesicles** that help them maintain their position in the water column. These features allow them to remain suspended in the water and perform photosynthesis effectively.