Once you understand this, its pretty simple. 50 hertz= 50 vibrations. 100 hertz=100 vibration. So to answer your question 200 hertz=200 vibrations. Your answer is C.
I would say D.....................
Answer:
They contain symbiotic rhizobia bacteria within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants; this helps to fertilize the soil
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The spinal cord is the main pathway for information connecting the brain and peripheral nervous system. The human spinal cord is protected by the bony spinal column shown to the left. The spinal column is made up of bones called vertebrae.Information (nerve impulses) reaching the spinal cord through sensory neurons are transmitted up into the brain.
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