Which of the following is a single replacement reaction? (20 Points) A. CH4 + 2O2 = CO2 +2H2O
B. 2AgNO3 + Cu = 2Ag + Cu(NO3)2
C. H2 + Cl2 = 2HCl
D. CaCl2 +Na2CO3 = CaCO3 + 2NaCl

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