While observing slides under a microscope, jack adjusts the microscope’s mirror so that a circle of light can be seen. which microscope is in use?
a. light microscope
b. electron microscope
c. scanning electron microscope

The body is protected against harmful flu viruses by

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes