Why is a scientific theory the most powerful explanation scientists have to offer? a)many different scientists have added data from their own experiments to build the theory. b)a theory is the same things as a hypothesis. c)scientific theories are usually the work of a single scientist. d)technology is used to provide the experimental data for a scientific theory.

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.