The lungs are considered to be apart of which hierarchical level?

What is an animal that lives by preying on other animals

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called