What 2 adaptations help diatoms stay afloat near the surface?

Diatoms have two key adaptations that help them remain buoyant near the surface of water: a unique silica cell wall known as a frustule, which is lightweight and has a large surface area relative to its volume, aiding in buoyancy. Additionally, many diatoms possess oil droplets within their cells, which further enhances their flotation by reducing overall density, allowing them to effectively access sunlight for photosynthesis.