Answer:
Cancer is basically a disease of uncontrolled cell division. Its development and progression are usually linked to a series of changes in the activity of cell cycle regulators. For example, inhibitors of the cell cycle keep cells from dividing when conditions aren’t right, so too little activity of these inhibitors can promote cancer. Similarly, positive regulators of cell division can lead to cancer if they are too active. In most cases, these changes in activity are due to mutations in the genes that encode cell cycle regulator proteins.
Explanation:
A secondary source is anything written after the fact
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9:3:3:1 would be the expected phenotypic ratio
D. Lava plateau
They are formed when lava flows from the volcano & build up over time as the molten lava is deposited & cools.
