They seem to be complex they are rapid and tend to spread
Answer: D: Thylakoids
Explanation:
Thylakoids - A flattened, membranous sac inside a chloroplast. They often exist in stacks called grana that are interconnected; their membranes contain molecular "machinery" used to convert light energy to chemical energy.
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The answer is, "B", "Developing country".
That as you increase in trophic level 1/10th of the nutrients is lost. Starting at the consumers (plants) all the way to humans.