Answer:
The proton–proton chain, also commonly referred to as the p–p chain, is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium.
D .Terrestrial biomes are distinguished primarily by their product
Answer:
it is cell differentiation
Explanation:
the cell would bursts and the fluid would come out through the exocytosis.
A model is useful in wide varieties but it is mostly useful when doing scientific investigations when having to experiment and when finding out the result or the conclusion to a study as it could serve as a basis as to how the study had resulted or formulated.
