The largest concentration of nitrogen is found in the , but plants and animals cannot use directly from the . Nitrogen fixation is the process of capturing and nitrogen into a form that is by plants.
Nitrogen can be added to the soil by applying to lawns or crops.
Nitrogen enters the food web when absorb nitrogen compounds from the soil and convert them into .

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

In which layer do organisms on earth love?

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above