Answer: C) As cells become more numerous, the amount of required growth factors and nutrients per cell becomes insufficient to allow for cell growth.
Explanation:
Growth factors are proteins that stimulate cell division.Two of the most important internal factors are kinases and cyclins. In most mammal cells stop dividing once they touch other cells this means that when a cell population reaches a certain density, the amount of required growth factors and nutrients available to each cell becomes insufficient to allow continued cell growth.
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Answer:
Many fossils are found only during certain periods in the geologic record. Scientists use these fossils to determine the relative ages of rock layers. The diagram shows relative ages of four fossils.
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Answer:
The answer is Nucleic acid. Your body uses carbohydrates, lipids and proteins for energy. The only biological macromolecule not used for energy is nucleic acid.
Explanation:
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Answer:Acidity or alkalinity of a solution is measured by concentration of hydrogen ions (H+) versus hydroxyl ions (OH-) and is expressed as pH level, an exponential scale that ranges from 0 (very acidic) to 14 (very basic).
Explanation:
