Oxygen is recycled in the

A nitrogen cycle

B carbon cycle

C none of these

D water cycle

During vomiting the food moves in the opposite side. Why?

During which phase of the cell cycle is the cell growing and preparing for cellular division? The males of a bird species do a "dance" and "sing a song" each spring. What is the main purpose of these behaviors?

If you were having a problem converting food to energy, which system might you want to have checked? A. Digestive system. B. Nervous system. C. Reproductive system. D. Integumentary system.

After applying a tourniquet, the injury from a patient's leg stops bleeding. this is called:

Is a person sexually mature when they reach adolescence or only when they reach adulthood?

Where would be the best place to find an alpine glacier A) Antarctica B) Greenland C) the Himalayas D) the North Pole

The Sun is A. a very small star. B. a medium-sized star. C. the largest star in the universe. D. the same size as all the other stars.

6. The blood component that has the greatest affinity for oxygen is the a) Lymphocyte" (b) Leucocytes (c) Erythrocytes (d) Thrombocyte

According to the endosymbiosis theory scientist believe early eukaryotes form from prokaryotes why do scientist believe that prokaryotes existed earlier eukaryotes

Areas of land covered with water for at least part of the year are called