The pathogenicity of the tubercle bacillus is due to which ONE of the following?

A. Ability to multiply within macrophages.

B. Delayed hypersensitivity reaction against the bacteria.

C. Direct toxic effect on host cells.

D. Effective antibody response.

E. Necrosis caused by expanding granulomas.

What word is used to describe differences of individual organisms

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.