The answer is because its crystal cools quickly. Obsidian rock usually forms when cooling happens instantly.
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Answer:
surrounded by two membranes
Explanation:
The nucleus is surrounded by two unit membranes. Together, the two membranes of the nucleus make the nuclear envelope. Therefore, the nucleus is said to be a double membrane-bound organelle. Likewise, chloroplast and mitochondria are also surrounded by two unit membranes and both are the double membrane-bound organelles. Like the nucleus, both chloroplast and mitochondria have their own DNA.
An organism must adapt to its environment in order for it to survive.
This is evidenced through fossil records, from which we can tell that
those organisms which did not adapt failed to pass their genes onto
offspring. An example of such an adaptation might be giraffes developing
long necks, so as to feed upon foliage other animals are not able to
reach.
Answer:
Dogs
Explanation:
That's the answer. Hope that helps.