HELP ASAP FOR BRAINLIEST! Which of these describes a nebula?

A. star much larger than the sun
B. star close in size to the sun
C. cloud of gas and dust
D. cloud of gravity and pressure

Which osmotic and ionic strategies must marine teleost fishes employ?

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

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