True, the two lines are parallel
A scientific theory can always be disproved if someone comes along with better evidence which shows another theory is true. However, most other theories are small improvements on existing ones. Evolution and natural selection (the theory that animals' populations change over time because their environment encourages specific different features for individuals that happen with mutation) was an improvement on the existing "theory" that animals were built to be fit for their environments. The earth rotating around the sun was a theory improving on the idea that the sun and the earth move around so that it looks like the sun moves around the earth. All of these happened because there was evidence, so while theories aren't always absolutely true, many modern theories are typically well-tested and if they aren't, they are usually refered to as hypotheses or models (although models can sometimes also be theories, like the Standard Model)
Answer: The structures that are found in both eukaryotic and prokaryotic cell are-
ribosomes, DNA, cytoplasm.
Ribosomes are biomolecular complex, composed of RNA and protein and act as the site for protein synthesis in all the cells of the living organisms.
DNA (deoxyribonucleic acid) is considered as the genetic material of all life forms. It possesses the genetic instruction in the form of nucleotide sequences.
Cytoplasm is the fluid compartment of all the cells (where all the essential biochemical reactions take place) that is surrounded by cell membrane.
Thus, ribosomes, DNA, cytoplasm is the right answer.
