Plz hurry! ! i need now! like no joke! plz me now! 20 points + brainliest! as one of america’s leading experts on deep-space debris, the president has asked you to brief him on the dangers posed to earth by asteroids and meteoroids. write a one-page briefing to the president explaining why you do (or do not) believe that asteroids and meteoroids are a grave threat during the current administration, and what evidence scientists have to support your point of view.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

3. dark matter

empty space could also be a simple vacuum