Tropical and polar climate zones are very distinct. this is because
a. the sun's rays are more concentrated near the equator
b. the sun's rays are more concentrated near the poles
c. the poles absorb sunlight more effectively
d. clouds reflect more sunlight at the equator

Convert 0.14 kilograms to grams.grams

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

What substance acts to prevent sudden ph changes in bodily fluids?