What is free nitrogen?

8

nitrogen that is ready for plants to use

nitrogen that has been fixed by bacteria

nitrogen that cannot be used by organisms

nitrogen that is returned to the soil by decomposers

Plants and animals of an ecosystem do what?

What is a cell made of?

What do nitrates phosphates and carbon dioxide do in ponds lakes and rivers

In which body cavities are the lungs located?

Diffusion of water into or out of a cell is called a) solubility b) endocytosis c) osmosis d) diffusion

Which of the following statements are incorrect? A. Stem vascular bundles in monocots are in a ring. B. Dicot roots are fibrous in structure. C. Pollen in monocots has one opening. D. Dicots have floral parts mostly in multiples of fours and fives.

In the living world, there is a great deal of genetic variation. The genetic information of dogs differs from the genetic information of cats. The genetic information of plants differs from the genetic information of bacteria.

Explain the concept of same DNA in all body tissues

What happens in meiosis I that does not occur in meiosis II?

What is the meaning of calories