Place the steps of circulation described below in the correct order, beginning with C.
13. _C_
14. ___
15. ___
16. ___
17. ___

A. De-oxygenated blood exits through the pulmonary artery and travels to the lungs to pick up oxygen and get rid of carbon dioxide

B. Oxygenated blood in the left ventricle leaves through the body’s main artery, the aorta, and travels throughout the body

C. De-oxygenated blood from the body enters the heart through the right atria, then right ventricle

D. Blood delivers oxygen needed for cellular respiration to all cells in the body and removes the CO2 that is created as a result.

E. Newly oxygenated blood is brought back to the heart through the pulmonary veins into the left atria and then down to the left ventricle

In what for do plants utilize nitrogen? why do they need nitrogen?

To be or not to be that is da question

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.