I put 100 points into this.. Are there any parts of the human body that get oxygen directly from the air and not from the blood?

Classify the descriptions and examples as endocrine or neural control

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?