What is the primary mode by which a macrophage engulfs pathogens

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity