Most stars spend the majority of their lifetimes as which type of star?
a. giant
b. dwarf
c. protostar
d. main sequence user: a star's spectral class is related to which of these characteristics? select all that apply.
a. mass
b. radius
c. chemistry
d. temperature
e. distance to the center of its galaxy

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

It is really hard for me right know