What is the meaning of the term diffusion? 1. Transport of materials or molecules small enough to cross through pores in a membrane
2. Transport across a membrane requiring a transport protein but not requiring energy
3. Transport of water to dilute molecules that are highly concentrated on the other side of the membrane
4. Transport or dispersing of molecules until there is a uniform concentration of molecules throughout a solution

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen