The paramecium is a single-celled, eukaryotic protist that survives and thrives today. based on current theory, from which organism did the paramecium and all other single-celled organisms evolve? a) plants b) bacteria c) yeast cell d) another protist

Ans. (B) bacteria.

Prokaryotes are most primitive organisms in the earth. According to endosymbiotic theory, eukaryotic cells are evolved from primitive, prokaryotic cells.

It states that the eukaryotic cell evolved as the eukaryotic organelles, such as chloroplasts and mitochondria are originated from symbiotic bacteria, such as cynobacteria and proteobacteria.  

Hence, it can be concluded that the paramecium and other single-celled eukaryotic organisms are evolved from bacteria.

Thus, the correct answer is option (B).

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.