The first organisms are autotrophs (primary producers)
The answer is the last one (it needs a medium through which to travel) it is not true about radiation. A radiation is the emission of energy in the form of waves or particles through space or through a material medium. This includes; electromagnetic radiation, such as a radio wave, microwaves, visible light, x rays, and gamma radiation.
Answer:
0.132 meters is the wavelength of sounds to which people are most sensitive.
Explanation:
Frequency of the sound human ears are most sensitive to = 
Speed of the sound wave = S = 330 m/s
Wavelength of the sound human ears are most sensitive to = 



0.132 meters is the wavelength of sounds to which people are most sensitive.
The battery itself contains chemical energy, which is converted to electrical energy, and then converted to mechanical energy.
There are 30 inches in 2.5 just know that a foot is 12 inches so 12 times 2.5 is 30