Why do objects appear black when light shires on the object

Evaluate this exponential expression,8. (2 + 3)2 – 42

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

If a solution had a ph of 7 what is the solution