Which of these sentences is true about nitrogen?
as nitrogen is the rarest gas in the atmosphere, very few organisms can use it directly.

even though nitrogen is an abundant gas in the atmosphere, very few organisms can use it directly.

even though nitrogen is an abundant gas in the atmosphere, no organisms can use it directly.

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d