The scales or outer layer of an artichoke are called bracts
The first organism in the food chain is the producer.
Answer:
An experiment that directly test the hypothesis.
Explanation:
Although there is quite a bit missing from Mary's scientific investigation, the thing that sticks out the most is the fact that Mary is missing an experiment. Mary's hypothesis states that people would fall asleep faster if their room color were to be painted blue. To prove that her hypothesis is true, Mary would need to conduct an experiment to see whether or not she was correct.
Answer: because there is no sunlight
Explanation: Solar cells are also called as photovoltaic cells. They convert light energy to electricity
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