Question

The primary source of heat is .................... Fill in the blank

Answer 1

Hey friend

The correct answer should be SUN.

Bcoz it seems to be the primary source from which all organisms get energy in the form of heat.

Mark brainliest if it helps

Answer 2

The primary source of heat is Sun.

In the entire solar system, it is the largest example of any type of a heat energy that one would be able to find.

The sun is known to radiate so much of heat due to the extreme pressure in its core where nuclear fusion of Hydrogen into Helium occurs.