Which statement about crustaceans is true? *

(A) all have the same number of appendages

(B) all have an internal skeleton

(C) all have an exoskeleton

(D) only some have jointed appendages

Select the word from the list that best fits the definition a system made of 25 satellites

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.

The smallest parts of these that retain their original properties are called