The diagram shows a sponge. What is the function of the structures labeled X?

providing protection from predators
fertilizing eggs
filtering and digesting food
stinging prey

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes