A) single loop
Fish have a two-chambered heart in which a single-loop circulatory pattern takes blood from the heart to the gills and then to the body.
The part of the brain stem that regulates vital activities such as heartbeat,breathing and digestion is the<u> Medulla oblongata. </u>The bottom part of brain which regulate your breathing,heart rhythms,blood pressure and swallowing.
The respiratory center is located in the medulla oblongata and is involved in the minute-to-minute control of breathing.It's locate where the brain and spiral cord connect, it help in control vital processes like our heartbeat, breathing and blood pressure.
This also responsible for reflexes of the face and throat like - coughing,sneezing,gagging. It can lead to respiratory failure, loss of sensation, paralysis,it causes 'brain death" and person can not survive.
To learn more about Respiratory center here
brainly.com/question/14446082
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Answer:
hmm I'd say something like "Solar and Wind energy systems are renewable sources and ultimately are healthier for the planet, the drawback is that other resources (i.e oil and coal) tend to be cheaper"
Not sure let me see if i can find something
