Which of the following is an echinoderm that moves by waving its arms?
a. sea star.
b. brittle star.
c. sea urchin.
d. sea cucumber.

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?