Chordates are animals that are characterized with the presence of pharyngeal slits, notchord, a dorsal hollow nerve cord and another tail feature.
The pharyngeal slits of chordates develops in the internal pharynx as a cleft, which further extends into the external pharynx. The pharyngeal slits in aquatic chordates functioned first as suspension-feeding device, which acts by straining foods from water to be ingested by such animals.
The pharyngeal slit is now commonly known as a filter feeding device
the the second least force as it go it lose more and more force until it falls when it force the ball to drop the minute it hits the floor it has the least force
