An interesting website I found. Lots of science stuff.

Part 1: Getting Energy
Organisms have to get energy from outside of their body in order to survive.  Producers, like plants and algae, make their own food by absorbing energy from the sun.  Any organism that can't make its own food using a non-living source has to get energy from other organisms, and are called consumers.  There are lots of different types of consumers.  Herbivores eat plants to get energy, and are found anywhere that plants are found.  Cows, deer, squirrels, tomato bugs, and many tiny animals that eat the algae in the ocean are all herbivores.  Carnivores are meat eaters, like T-rex, sharks, lions, praying mantis insects, and vultures are all carnivores.  Carnivores can get their meat by killing it (predators, like lions and sharks, kill prey, like antelope or fish) or by finding it (scavengers, like crabs and vultures).  Some organisms eat both plant and animal material, and are called omnivores ("omni" = all, and "vore" = to eat).  Humans, birds, raccoons, and bears are all omnivores.  Organisms that consume dead and decaying material and turn it into broken down minerals and nutrients are called decomposers.  Fungi (mushrooms, molds, etc.) are almost all decomposers, and so are earthworms, which consume dead plant material and turn it into soil.

https://weedscience.weebly.com/