<span>Answer: Cellular differentiation is responsible for one daughter cell becoming a sieve tube whereas the other becomes a companion cell. Cell differentiation occurs as different genes are switched on and off.
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The correct answer will be the second one Growth of a tumor
Answer:
The correct answer is probably A: The needs of society help determine the types of research conducted. For example, people are more likely to research ebola when there is an outbreak, right? B isn't true: for example, society doesn't let scientists experiment on unwilling humans! C is probably true, but it is more specific than A--that is, C only applies in certain cases. Society ALWAYS applies to science. D isn't correct either: society encourages research for the greater good,
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