Energy Flow Through Ecosystems

1. Some primary producers are organisms such as plants, algae, and some bacteria. They use photosynthesis to obtain energy.

2. The second trophic level is made up of herbivore animals that eat only plants, they get their energy from eating plants.

3. Predators are classified as the third trophic level because they feed at several trophic levels, if there are even larger predators they will make-up higher trophic levels.

SOURCE: http://goo.gl/5QeNS

SOURCE: http://goo.gl/wOq6q