Which organism is capable of quick movement in response to its environment?

Paramecium is capable of quick movement in response to its environment due to its unique structure and the way it propels itself. This organism is covered in tiny hair-like structures called cilia, which beat in coordinated waves. This rapid beating allows Paramecium to swim efficiently through water and respond quickly to stimuli in its environment, such as changes in light, temperature, or the presence of food or predators.

In contrast, other organisms listed have different movement capabilities. Amoebas move using a slow process involving pseudopodia (extensions of their cell membrane), which allows them to crawl rather than swim quickly. Bacteria can exhibit movement through flagella or other methods, but their movement is typically less directed and slower than that of Paramecium. Sponges, on the other hand, are sessile organisms that do not exhibit movement in response to environmental changes in the way that Paramecium does; they rely on water currents for feeding and oxygenation rather than active movement. This highlights the distinct advantage that Paramecium has in terms of quick responsiveness to environmental changes.