The feeding mechanism of a sponge can be summarized as such: Water is drawn into the by the beating action of . Small particulate matter and tiny plankton are trapped and eaten, while the water then flows out through the large opening at the top.

The answer is option b.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on