Friedrich Miescher in 1869
Its d the cell wall. The plant cell contains a cell wall that is absent in a animal cell.
Answer: bc any living organism must take in energy via food, nutrients, or sunlight n order 2 carry out cellular processes.
Explanation: The transport, synthesis, n breakdown of nutrients n molecules n a cell require the use of energy.
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A signaling pathway would need to be regulated because of efficiency, to make what you need when you need it.
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