I would say estuary, because that's where a fresh water river and an ocean meet, and that leads to a transition between salt to fresh water.
The function of a protein is determined by its shape. The shape of a protein is determined by its primary structure (sequence of amino acids). The sequence of amino acids in a protein is determined by the sequence of nucleotides in the gene (DNA) encoding it.
is that what you were asking about?
Answer:
cell membrane
Explanation:
lets some things pass through and not others
Answer:
a lot of things
Explanation:
you see, we have polluted the planet, and if we keep on doing it, then the planet will die
