The respiratory and circulatory systems work with each other in this manner, the respiratory system will obtain oxygen then the circulatory system brings the oxygen to different parts of the body then it also takes carbon dioxide from different tissues of the body and bring carbon dioxide to lungs then the respiratory system takes carbon dioxide outside the body during exhalation
Answer:
This phenomenon is called Niche Differentiation, it happens when several species live in the same area but different parts. Hope that helps! :)
B. The Threshold describes the minimum level of stimulus required to ctive a neuron. Hope that helps
Hiking is kinetic energy.