Answer:
True
Explanation:
When an environment with a lot of ice such as a mountainous place or Antarctica, global warming can cause the ice to melt. This new water has to flow somewhere, most likely to the nearest body of water like the seas.
T cell activation is initiated by an activated B cell.
The B cell presents antigens on its MHC receptors. The T cell recognizes the antigen bound to the MHC. There are other cosignals that fully activate the at cells but the antigen on the MHC receptor on the B cell is where it all starts.
Insert dna in plasmid
plasmid multiply
target cells reproduce
cells produce proteins
1s orbital
Explanation:
The electron has to go into the first energy level, in the 1s orbital. Helium, with two protons, will have two electrons. These are placed one at a time into the 1s orbital. This makes helium a very contented atom.
At the bottom of the pyramid is the grass where as you move up the number is less
