Label ALL of the following structures:
1. right atrium
2. left atrium
3. right ventricle
4. left ventricle
5. pulmonary vein(s)
6. aortic semilunar valve
7. pulmonary semilunar valve
8. tricuspid valve
9. bicuspid valve
10. inferior vena cava
11. superior vena cava
12. aorta
13. pulmonary artery(ies)

According to the loco mass the mass of reactants and products

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form