Two proteins in the same cell perform different functions. This is because the two proteins are
composed of
A. chains folded the same way and the same
sequence of simple sugars
B.
chains folded the same way and the same
sequence of amino acids
C. chains folded differently and a different
sequence of simple sugars
D. chains folded differently and a different
sequence of amino acids

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

cell division is not regulated in tumor cells.