Answer:
C
Explanation:
A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.
When a plant opens and closes its stomata, it is maintaining homeostasis. Homeostasis includes the regulation of carbon dioxide and water levels necessary to perform photosynthesis. It also allows the plants to store water to prevent them from dying
X shaped chromosomes are linked together at a place called the centromere
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