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i have put an image for a diagram of the heart in the answers becuase you did not provide a diagram so i hope this helps
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B. Plankton are a food source for humans
Plankton is food for many small fish. With the abundance
of Plankton, these fish can thrive. When these smaller fish thrive they are food to bigger fish that we eat. Since the smaller fish thrive then the bigger fish that we eat also thrive. This makes bigger fish an abundant food source due to plankton supporting the smaller fish and other organisms.
Hope this Helps!
The central nervous system is a wide network of neurons which transmits signal to each other through synapses. These are all electrochemical reactions that occur in the brain and the spinal cord.
There are three types of neurons according to their functions. The sensory neurons are responsible to carry all signals from the rest of the body to the brain. On the other hand, motor neurons carries signals from the brain to the outer parts of the body. The third type is called the associations nerves which connect signals between the sensory and motor neurons.
