The frog<span> heart has 3 chambers: two atria and a single ventricle. The atrium receives de-oxygenated blood from the veins (blood vessels) that drain the various </span>organs<span> of the body. The left atrium receives oxygenated blood from the lungs and skin...i believe this is right :)but im not sure but this is some of what one of my books say.</span>
Answer:
Essential structure and particular structure
D. The heat is there via convection from the sun
Create a loss of biodiversity and change the hydrosphere since it is dependent on minerals.
