Match list I with list II

	List I		List II
a)	Red dwarfs	e)	Carbon nitrogen cycle
b)	Stars having higher temperatures	f)	Isotope of carbon
c)	Blood circulation	g)	Proton-proton cycle problems
d)	Radio carbon dating	h)	radio sodium

	a	b	c	d
1.	e	g	h	f
2.	g	e	f	h
3.	g	e	h	f
4.	f	e	g	h

The energy generated in red dwarfs is the product of nuclear fusion of hydrogen into helium by way of the proton–proton (PP) chain mechanism.

The sequence of thermonuclear processes known as the carbon, nitrogen, and oxygen cycle is what produces the majority of the energy emitted by hotter stars. In very cool stars, it doesn't function at all and is only a minor source of energy for the Sun.

Carbon-14 isotope of carbon is used for carbon dating process for its radioactive nature.

Radioactive sodium is used in radiocardiography for determination of the blood circulation velocity.