How does the lymphatic system in fluid balance within the body?

a: it returns water back to the blood from the fluid between the cells.
b: it triggers the thirst reflex, which signals the body to ingest more fluids.
c: it produces water, which is then distributed throughout the body.
d: it absorbs water from ingested food and moves it through the body.

About __ of the mass of the cell is water

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.