tube sponges come in many natural colors such as brown, dull green and yes, yellow. secondly tube sponges reproduce by spliting their selves in half. so i guess their only family is the one sponge.
No.
Yes they are.
zooplankton
porifera
the toe
a type of sponge that is purple
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They eat bacteria, plankton and detritus.
Many coral reef organisms eat yellow tube sponges like angelfishes, filefishes, cowfishes and spadefish. Also the Hawksbill sea turtle.
It helps them stay on the water standing up
It helps them stay on the water standing up