Question

What is dark matter and dark energy ??

Answer 1

Dark phase of photosythesis is called ....

Answer 2

DARK MATTER ===>

non-luminous material which is postulated to exist in space and which could take either of two forms: weakly interacting particles ( cold dark matter ) or high-energy randomly moving particles created soon after the Big Bang (google)
Dark matter is a hypothetical type of matter distinct from ordinary matter such as protons, neutrons, electrons, and neutrinos. (Wikipedia)

DARK ENERGY ==>

a theoretical form of energy postulated to act in opposition to gravity and to occupy the entire universe, accounting for most of the energy in it and causing its expansion to accelerate(GOOGLE)
In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. (Wikipedia)