Which correctly defines a basic solution

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Which compound contain an iron with a 3+ charge

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