What is Calvin exactly doing with the oxygen torches by holding?

Question

In Life (2017), Calvin is holding each oxygen torch for a few seconds with its tentacles and losing it.

We can see the oxygen torch glowing through the transparent skin of Calvin. What is he doing there?

Answer 1

Absorbing nutrients.

The oxygen torch is creating energy, heat, light, and oxygen. We do not know for sure which of these things Calvin actually needs, but we can assume he is holding the torch to absorb as much of it as possible.