Which of the following involves pathogens or an invading viruses or bacteria A- T cell
B- B cell
C- macrophage
D- red blood cell

Chlorophyll is a green pigment that is found in which are closely related. a) fungi and plants b) green algae and plantlike protists c) plants and plantlike protists d) plants and green algae

Which best explains how this maneuver unblock a person's airway?

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.