<span>Features matched with its description
A: stalactites 3: tubes with hollow centers
B: stalagmites 2: tubes without hollow centers</span>
<span>C: speleology 1: cave science</span>
D: speleothems 4: cave features
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</span>Speleology is shortly defined as the<span> scientific study of caves.</span> Speleothems are structures<span> formed in a cave by the deposits of minerals from water dripping from the fractures of the ceiling of the cave. Most common types are the stalactites and stalagmites. </span>
<span>Stalactites began as a ring of crystals which later becomes small tubes with a hollow center.</span><span> Stalagmites, on the other hand, are tubes formed without hollow centers. </span>
Botox is an option for those who don't want to get a surgery, but when it´s not applied by professionals it may bring worse consequences immediately, a large amount applied is going to freeze part of the face where it was inyected, and would give a rare unnatural look besides the pain it causes in the zone, because it works directly in the muscles, the person has to wait several weeks, or months until the body absorves the botox and the face could go back to its normal look. Botox freezes the muscle activity and avoid wrinkles formation or expression lines for about 5 or 6 months.
Answer:
I think it's parathyroid glands
The medulla oblongata is the center of the brain responsible for circulation and respiration. It helps regulate breathing, digestion, sneezing, swallowing, and heart and blood vessel function.
1) She developed a hypothesis 2) She put one plant near the window... 3) Every few days 4) Over six weeks