In a circulatory system, fluid is pumped through specialized, enclosed vessels.
a. open
b. closed

Monitor and apply fix up stratorgies

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine