60 years is three half life for the substance, so 40*1/2^3=5
3, 1, 2, 5, 4. :-) I hope this helped. DNA is the smallest and the atmosphere is the largest.
Answer: Gas giants are larger, have more moons, and are less dense. They also are outer planets. Terrestrial planets are more dense, have a rocky and hard surface, and less moons sometimes no moons. They are called the inner planets.
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
