What are 4 methods of determining population *!

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

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

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity