The characteristics that distinguish phylum Annelida worms from simple worms include(s)
A. nephridia, a heart, and, in some cases, jaws.
B. the lack of a true digestive system.
C. metamerism.
D. nephridia, a heart, metamerism and, in some cases, jaws.

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.