Rigor mortis occurs at death due to a lack of:

A) cAMP.

B) DNA.

C) RNA.

D) ATP

E) tRNA.

D) ATP

Explanation:

Rigor mortis

Rigor mortis also called postmortem rigidity,

It is the third stage of death.

The signs of death are, due to chemical change, stiffening of the limbs of the corpse.

In human beings, rigor mortis occurs around four hours after the death.

The stage of rigor mortis occurs due to lack of ATP,

because of the lack of ATP, there is no myosin shifts so muscles remain contracted.