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.
Different cell structure between the two.Prokaryotic is just a cell while eukaryote has room to have the nucleus and other organelles.
Abiotic means not alive like rocks and soil. Abiotic Factor that affect the zebras in the grasslands is: water
Still trying to figure out the other abiotic factors.
Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density
