A clarification

When Wendy was referring to the energy from radioactive material she said that electrons were releasing the energy. In fact, the energy released from radioactive material is from protons and neutrons in the nucleus, the core of the atom.

Also, Denise asked us about selective pressure.

DNA are the body's instructions, telling the body what colour our eyes, hair or skin should be. These final products are called phenotypes. In evolution, pressures from our environment put pressure on the phenotypes, not the DNA directly. The phenotypes that can survive do, and pass on their genes. The phenotypes that can't survive die out, so the species overall slowly changes to the more suitable genotypes and phenotypes. This is how evolution affects our genes.