How does the nucleus contribute to maintaining homeostasis for the cell? A.
The nucleus stores water and food for the cell.

B.
The nucleus directs cellular activities for the cell.

C.
The nucleus produces chemical energy for the cell.

D.
The nucleus packages and sorts proteins for the cell.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.