Celina has a water sample that's contaminated with salt and microorganisms. which method should she use to purify the water? a. distillation b. filtration c. osmosis d. reverse osmosis

What are the steps of how energy is transformed in plant cells?

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!

Why do mountaineers become breathless as they reach high altitudes