The sphincter (that which binds together) muscle at the end of the digestive tract is the:

the sphincter muscles at the end of the digestive tract is the anus.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above