A stronger, more docile horse, for example, or a cow that produces more milk. But it's slow. Decades can pass before improved animals are developed. With the world population expected to reach 10 billion by the year 2030, we don't have the time. Farmers will need to produce more food with many of the same resources they have now.
Biotechnology is part of the strategy to produce more with less, right now.
Natural engineering Like humans, animals are a marvellous interplay of chemical reactions. Some of these reactions detect light and transmit the information into your brain, allowing you to see this page. Others break down food into a form the body can use, while still others reassemble these simple molecules into tissues or use them for energy. Some chemicals the body uses are called hormones. These substances are secreted by glands and act as switches inside the body to start other processes.