Which set of traits best characterizes the amphibian class?

select one:

a. tetrapod, gills, moist skin, scales

b. tetrapod, lungs, moist skin, scales

c. tetrapod, gills, lungs, scales

d. tetrapod, gills, lungs, moist skin

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

Does masterbation affect height growth or loss of growth hormone?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?