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>
THE CORRECT ANSWER IS B. Hope this helps :)
My description:
During the first 10 hours it did not change and remained at 1m individials. After 15 hours, the number of bacteria increased 4 times the initial number. 5 hours later, it had remained already 20 hours at a stable temperature of 15 degrees and had reached a rercord of 10 million individuals, remaining 15 hours at the same position. After that, it started decreasing and 10 hours later it had gone back to 4 million individuals.
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