Answer:
Most fish use gills for gas exchange instead of lungs.
Explanation:
Answer:
HDL are most prevalent in the body when the person has high physical activity and a healthy diet.
Explanation:
Physical activity and a diet rich on fruits, fiber, omega 6 and esential fat acids increases the level of HDL, which responsible on drecreasing the levels of cholesterol in blood.
Genetic factors might also impact on the levels of HDL.
Answer:
They are packed with T-cells and B-cells.
They can become inflamed when fighting foreign material or pathogens.
Explanation: