What can a bacterium do to respond to high levels of transferrin?

Transferrin is the main protein in the blood that carries iron throughout the body. Iron is an element important to many of the body functions, but its main role is as the building block for hemoglobin, the protein that helps red blood cells bind oxygen for delivery to the tissues. When transferrin levels are high, it indicates a deficiency in iron.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

there’s no image attached but i can if you want: )