4. Which of the following is true of both T cells and B cells? a. They are produced from stem cells of the bone marrow.
b. They can attack and destroy invading pathogens.
c. They are an important part of the inflammatory response.
d. They respond to pathogens circulating in the bloodstream.
e. They produce antibodies.

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?