The hollow<span> part of a </span>bird bone<span> isn't wasted space. In some </span>bones<span>, the </span>hollow<span> cavities contain extensions of the air sacs from the lungs. These air sacs help the </span>bird<span> to get the oxygen it needs to fly quickly and easily.</span>
Chemicals are the best way
The answer is B. Lysosome. Lysosomes break down old organelles and other unwanted materials. I hope this helps!
About 1/3 of earth's land surface is used for agriculture.
Well, to put it to the simplest way I can get it. Protein acts as a car engine because it gives us the energy to go and do things like a car engine gives a car the will to move.
