Allelopathy, the pine needles make the ground more acidic so weeds cannot grow and steal nutrients the tree needs
The cell membrane performs those functions. It is the outer layer of a cell and it creates a barrier, regulates material entry and exit, uses chemical signals, and creates structure.
The answer is theory because it says if and that means theory
Well the sun wouldn't be up yet it would be dark and when you wouldn't be able to see it they would see it in the sky
Hello!
An amino acid has five basic parts. An amino group, a carboxyl group, a central carbon atom, a hydrogen, and a R group.
The r group is the side chain specific to each amino acid. The r group varies between each kind of amino acid, while everything else stays the same. Therefore, the r group decides the identity of the amino acid.
Hope this helps! Let me know if you need a more specific explanation.