Vertebrate immune cells, which are phagocytic, include i) neutrophils ii) macrophages iii) dendritic cells iv) natural killer cells vertebrate immune cells, which are phagocytic, include i) neutrophils ii) macrophages iii) dendritic cells iv) natural killer cells i, ii, and iii i and iv i and iii ii and iv submit

Ans: I,II and iii

Neutrophils are known to be immune cell that first travels to the site of an infection and they help infection by releasing enzymes that kills microorganisms.

Macrophages are white blood cells present in the immune system that digest cellular debris, microbes, foreign substances and microbes.

Dendritic cells: they function by processing and present an antigen material on the cell surface to the T cells of the immune system.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

the answer is definitely a