B I believe humans were around at that time
Because of different receptor types
Norepinephrine is also known as noradrenaline. It is released in the central nervous system which has a wide set of function in the body. This help in the activation of the flight or fight response by boosting the body to have an increased attention and reaction time. THis can increase the heart rate, dilate blood vessels and increased blood pressure however in other tissue function may vary due to the presence of various receptors that this neurotransmitter can activate.
1. Fossil fuels are easy to find and we relied on them for many years
2. pollution and it kills many people
the third one i have not yet figured out sorry i hope this works.
Answer: They can be found in Fossil Fuels
Explanation:
When animals die, they release carbon which goes into the ground and when it's stored for so long it turns into fossil fuels :)
