Different populations of species living in the same area. The sum of all the planet's ecosystems. You are about to plant hydrangeas in your backyard. Hydrangea flowers will be pink or blue, depending on the pH of the soil. Show your work.
Hydranga flowers tend to be pink in acidic soil.
Explain the difference between a theory and a hypothesis. A hypothesis is usually described as an educated guess. It is important to develop a hypothesis to guide in the design of appropriate experimentals. On the other hand, a theory is developed only after rigorous testing and re-testing of a hypothesis. Theories can still be proven incorrect over time or may become part of Law or Principle.