A reproductive barrier keeps similar species from interbreeding.
Serve as energy-storage substances in plankton etc .
The correct answer is B because that is the order form least complex to most complex. Hope this helps and have a good summer!
A star is provided with energy by a nuclear fusion reactions in its core. A nuclear fusion reaction occurs when the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become one helium atom.
