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Chemistry multiple choice question (all help appreciated)?

Research applicants of the basic principles of genetics have contributed greatly to the rapid production of new varieties of plants and animals.Which activity is an example of such an application? a.developing new irrigation methods to conserve water. b.selective breeding of plants and animals that exhibit high resistance to disease. c.testing new fertilizers on food corps. d.using natural predators to control insect pests. and An oxygen (O) is in an excited state. What will happen when an electron in this atom moves from the third to the second shell? a.Energy will be emitted by the electron. b.Energy will be absorbed by the nucleus. c.Energy will be emitted by the nucleus. d.Energy will be absorbed by the electron.

Public Comments

1. B and A
2. (b) selective breeding (b) energy will be absorbed I think
3. B (the only one that has to do directly with genetics...) A (When the electron moves down from an excited state, excess energy is released.)