Http://www.pbs.org/wgbh/nova/cancer/folkman.html
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There are different trophic levels at each stage. Trophic levels determine the amount of energy at each stage of the food chain. For example, the energy is 100% at the producer (plant), so it's the 1st trophic level, and so on. Energy amounts decrease as you go up a food chain, and you rarely find more than 5 animals in one because there is not enough energy left for the 6th consumer
Amino acid reactions. Amino acids via their various chemical functionalities can undergo numerous chemical reactions.
Answer:
Explanation:hmm think about your vocab
Roots and stems
Explanation: the cork of mature roots and woody stems is perforatedby nonsuberized pores called lenticels.