Answer:
The heart valves
Explanation:
The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.
Cell division has two checkpoints namely, G1 checkpoint and spindle assembly checkpoint. The checkpoint which determines if division has properly occurred is the G1 checkpoint. At this point, is a damage in the DNA is detected or the has not reach the optimum size, the cell is stopped in G1 and is not allowed to proceed to further process.
Lungs (20)Lose elasticity and capacity (40% between ages 20 and 80), increasing difficulty to oxygenate blood.
Dataare available for the study of seasonal variation in the incidence of one females. The proportion of males at birth is known as the secondary sex ratio.
According to sources, the most probable answer to this query is that meiosis is the cell division responsible for replicating gametes. These gametes are haploid rather than diploid cells.
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