When contrasting arteries and veins ,which of the following statements is true?
a. veins have thicker walls than arteries.
b. arteries have a thicker tunica media than veins.
c. veins have a tunica media while arteries do not.
d. arteries have valves, but veins do not.
e. arteries have smooth muscle in their walls, but veins do not.

How are organisms in the domain eukarya different from those in the domain archaea? o a. eukaryotes have a cell wall. o b. eukaryotes have mitochondria. o c. eukaryotes have more than one cell. o d. eukaryotes have dna. submit

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Beth’s hygrometer is reading a temperature of 30 c and a relative humidity of 65%. the humidity in the air is?