Which of the following animals has a single-loop closed circulatory system?
a. crocodile
b. frog
c. fish
d. human

What did the first language sound like

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

What is a group of organisms that are closely related and share similar characteristics