After a long time, a mature community is established and this community does not change unless it is

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

How are fossils most commonly formed

Which of the following cognitive skills have not been displayed by animals? a. using tools b. forming concepts c. transmitting culture d. using syntax