Please help!! Look at this diagram of light traveling from a pair of
keys underwater to a boy's eyes. Notice how the light
refracts as it is transmitted from the water into the air.
How does the actual position of the keys compare to the
position that they boy perceives the keys to be in? Do the
keys seem to be shallower, at the same depth, or deeper in
the water than they actually are? Explain your reasoning.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.