A Ecosystem

A ecosystem is a biological community of interacting organisms and their physical environment. I took a picture of this lake that was surrounded with water weeds, trees, and wildlife because its an example of a ecosystem. 

A Gymnosperm

A Gymnosperm is a seed that develops either on the surface of scales or leaves, often modified to form cones, or at the end of short stalks as in Ginkgo. I took a picture with this pinecone because its an example of a gymnosperm. 

Growth Rings

Growth Rings are a concentric layer of wood, shell, or bone developed during an annual or other regular period of growth. I took a picture with this piece of wood because it has growth rings in the center of it.