What kind of galaxy has arms of gas and dust?

elliptical galaxy

spiral galaxy

irregular galaxy

bar galaxy

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Which of the following is a common response to cell signaling?

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.