4. what is one way that members of archaebacteria are different from members of eubacteria? a. they have different types of cell walls and cell membranes. b. they have many cells that do different tasks. c. they are single cells. d. they lack nuclei in their cells.

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

The smallest parts of these that retain their original properties are called

Why are current extinctions of concern to enviromentalists?