37&38)Bilateral Symmetry: Bilateral symmetry is when the left and right sides of an organism can be divided into approximate mirror images of each other along the middle. The leaf and the hamster both have this symmetry.
35&36)Long Day Plants: A long day plant is a plant that flowers only after being exposed to light periods longer than a certain critical length, such as summer. Potatoes and lettuce are examples of long day plants.
33&34)Short Day Plants: A short day plant is a plant that flowers only after being exposed to light periods shorter than a certain critical length, as in early spring or fall. Strawberry plants and soybean plants are short day plants. The first picture is crushed soybeans and the second is strawberries.
32)Cambium: The cambium is a layer of tissue in plants or in this picture, trees. It contains the xylem and the phloem. It is responsible for the secondary growth of stems and roots.
31)Territorial Behavior: My dog is smelling a pole to see if any other dog had already marked its territory. Dogs mark their territory with their urine.
30)Homeostasis: Homeostasis is the maintaining of a stable internal environment. The person playing tennis is maintaining homeostasis by sweating to keep the body from overheating.