Sixty-five percent of the mass of bone<span> is an </span>organic<span> compound called hydroxyapatite. All </span>bones<span> formed by intramembranous ossification are irregular</span>bones<span>.
TRUE</span>
3:they are usually microscopic
Answer:
A. The amount of atmospheric nitrogen would decrease, and nitrogen-fixing bacteria would die off.
Explanation:
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2 is B. Water freezes and 4 is the rock breaks.