Answer:
<u><em>note:</em></u>
<u><em>find the attached solution:</em></u>
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Animals don't make Their own food. they instead depend on the food made by plants. hence no need for chloroplasts
V: velocity of wave
f: frequency
L: wavelenght
v = fL => L = v/f => L = (3x10^8)/(900x10^3) => L = 3.33 x 10^2m