How do single-celled decomposers get energy?
a.
they make their own food.
b.
they use a process called budding,
c.
they feed on living organisms.
d.
they break down dead organisms.

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