The top of this vine is called a tendril. It's called a tendril because it is the slender appendage of a climbing plant that has streched out and wrapped itself around my porch.
I took a picture of myself breathing onto a leaf because it represents how the carbon dioxide from my body helps the plant live and the oxygen from the plant helps me live. This would be considered mutualism.
My arm contains striated muscle fibers which connect to both ends of my bone to move my arm to and fro. The muscles are characterized by transverse stripes.
The leaf of a Gymnosperm would be a pine needle because a gymnosperm is a plant that has seeds unprotected by an ovary or fruit. This pine tree contains many gymnospermic leaves.
This picture has a tree cut into parts in it. With the tree cut like this, you can clearly see what is called the "heartwood" of the plant. Heartwood is the dense inner part of a tree trunk.