Cells get energy for their functioning through sunlight and other organic food molecules. ATP is a good example of energy pathways through photosynthesis.
Paramecium is a genus of unicellular ciliates, commonly studied as a representative of the ciliate group. Paramecia are widespread in freshwater, brackish, and marine environments and are often very abundant in stagnant basins and ponds. hope it helps
A. Survival of the fittest and natural selection are interchangeable terms.
Might be gene regulation, the process of turning genes on and off in normal development