First, what is a nebula?
A nebula is a cloud of dust or different elements (remember, the Space is to a big extent empty)
A planetary Nebula is a kind of nebula that is specifically formed with ionized gas that was released and surrounds a red giant star.
No human inhabitants because Polar vortex win lower temperatures in the Antarctic .

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What are the characteristics of settlements?
Settlements come in all different shapes, sizes and locations. The function of a settlement can be identified by looking at its shape, size, site and situation.
Find out more about this topic below:
What is a settlement?
What do we mean by site and situation of a settlement?
What are the functions of a settlement?
What is a settlement hierarchy?
What is a settlement?
A settlement is a place where people live. A settlement could be anything from an isolated farmhouse to a mega city (settlement with over 10 million people).
Settlements can either be temporary or permanent. Temporary settlements include things such as refugee camps.
Recreational - fun, non-essentials like parks.Transport - roads, railways, and airports.Agricultural - farmland.Residential - housing.Commercial - businesses and factories.
Answer:
D. It has the same kind of vegetation throughout.
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Answer ↓</h3>
The hardest natural substance is a diamond.
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Explanation ↓</h3>
Made entirely of carbon, diamonds are the hardest natural substances.
Diamonds can be scratched, but it's hard to do so.
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