A paramecium is a single-celled organism that lives in ponds and other bodies of water. One of the challenges for a paramecium is A paramecium maintains homeostasis by responding to variations in the concentration of salt in the water in which it lives. (The concentration of a solution is equal to the
amount of solute that is dissolved in a given amount of solvent.) The contractile vacuole is a star-shaped structure that helps the paramecium to pump out excess water.
Explain how water moves into and out of the paramecium. What natural process is involved? Without a contractile vacuole, what could happen to the paramecium if there
was a lower concentration of solute (higher concentration of water) outside the cell membrane than inside? Why? Explain using specific details.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

2%? i tried finding the exact sorry if it's not 100% correct ; -;

that scientist would be robert hooke