Particulate matter in the air has caused irreparable damage to the DNA of an epithelial cell in the lung tissue. This repair is discovered during the G1 checkpoint of the cell cycle. Which of the following will most likely happen to the cell?

A) The cell will divide normally and then each new cell will undergo apoptosis.
B) The cell will divide normally and will repair the DNA during the next cell cycle.
C) The cell will either undergo apoptosis or ignore cell signals and proliferate, forming cancer.
D) The cell will enter the G0 phase and repair the DNA before entering the M phase for cell division.

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.

1. the geologists have established a set of principals that can can be used o determine the relative ages of rock. this principal is applied to sedimentary and volcanic rocks. the rocks exposed to wall of grand canyon has layers and by studying the number of horizontal layers in the rock(strata) the relative age can be determined. the layer first formed will appear at the bottom and the the layer of strata last formed appear at the top. by using this information the approximate age of rocks can be determined.

2. carbon dating is used to find the relative age of rock in numbers which means for the rocks that has age between 1-70,000 years.

3. for the rocks of age range between 1,000 - billion of years potassium-argon dating is used.