Why exercise raise body temperature?

This is because only approximately 20% of the energy produced in contracting muscles is used for muscle contraction; the remaining 80% is converted to heat energy, and therefore exercise causes an increase in muscle temperature. The heat is distributed to the body by the circulation and increases body temperatures.

Explanation:

≅200-130 milions years ago pangea splited in 2 continents

the index of refraction of the second medium is higher. i just took the test trust me !