HELLPPP I asked this multiple times can sum1 please help:((( Which of the following is the MOST common source of indoor air pollutants in less-developed countries?

A. poorly ventilated cooking fires
B. carbon monoxide from vehicles
C. cleaning solvents
D. air-conditioning units

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Mr. olajuwan was in a horrific snowmobile accident. afterwards he had trouble walking and he had a loss of balance. which of the 4 major brain region was probably demaged