These unsegmented worms have a full digestive system even when parasitic.
When the upper water layers warm in the summer months, they become separated from deep water by a transition zone known as a thermocline. In a thermocline, the temperature decreases rapidly with small increases in depth. This phenomenon linking temperature change with depth is called temperature stratification.
Answer:
I think it might be heart, lungs, blood, arteries, veins, and muscle cells
Explanation:
Answer:
i am pretty sure its indicator
My best guest is probably C or A.
