Cilia from the basilar membrane are embedded in a rigid structure called what?
a. cochlea
b. tectorial membrane
c. semicircular canal
d. cupula

Cilia from the basilar membrane are embedded in a rigid structure called B. Tectorial membrane .

Explanation:

Tectorial membrane  ( TM ) -

TM is present in the inner ear , it is one of the acellular  membrane in cochlea in the inner ear .

The location of TM is just above spiral limbus .

Tm have three zone distribution , the limbal , middle  and the marginal zones . The limbal zone being the thinnest , and the marginal zone being the thickest .

The sterocilia is embedded in the Tm and helps in hearing .

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."