A cell with a 10% salt concentration is placed into a beaker that contains a 20% salt concentration. The cell shrinks, as shown in the diagram below.
20% Salt
Water moves
out of the cell
10% Salt
Cell shrinks in size
Water Molecules
Which part of the cell controls the movement of substances?
A. mitochondria
B. cell membrane
C. nucleus
D. chloroplast

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.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

c. live where it’s cold and icy