Answer:
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells.
Explanation:
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The answer is <span>fermenting plant material to produce ethanol. The farmer was able to come up with a new product besides his harvested plants.He can now make this as a business and start to gain profit. Ethanol can also be linked as a source of material to make other related products. </span>
Answer:
No. Instead they contain enzymes.
