Answer: a star expels most of its outer material until only the hot core remains, which then settles down to become a young a white dwarf
Explanation:
B.) is the answer. I think it is. I'm not completely sure. But I think this is the right answer. Can you mark me brainliest if it is please.
Hypotonic.
In hypotonic environment, the water moving into the Paramecium cell by osmosis. Paramecium cells regulate water through special organelles which are known as contractile vacuoles. Paramecium is a freshwater organism, which means a hypotonic environment is its typical ambience.
The answer to your question is A
