What is a main source of pollution for Lake Okeechobee, A. Large amounts of sewage (human waste) are dumped into the lake.
B. Fertilizer from sugar cane fields flow into the lake.
C. Large amounts of oil from boat engines are released into the water.
D. Many factories line the shore of the lake and contaminate the surrounding water.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

la transducción de señal ocurre cuando una molécula de señalización de fluido extracelular activa un receptor de superficie de la célula.