What is the scientific name for the layer of gas that surrounds the earth?
a. lithosphere
b. hydrosphere
c. biosphere
d. atmosphere

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

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur