Final answer:
Some organisms have physical features that create buoyancy and keep them suspended in water, such as flat bodies, long spines, and feathery projections.
Step-by-step explanation:
Some organisms have physical features, such as flat bodies, long spines, and feathery projections, that create buoyancy and keep them suspended in water. For example, fish have a streamlined body and fins that help reduce water resistance and propel them through the water. Similarly, phytoplankton have adaptations that allow them to float in slow-moving water, such as their small size and the ability to form colonies.