Mating Behavior

Mating behavior is the actions between mutually attracted individuals of the opposite sex. Male peacocks  spread their colorful tail feathers, like the ones pictured here, to attract female peacocks.

Homologous Structures

Homologous structures are body parts that are alike because, according to the theory of evolution, the species in question share a common ancestor. For example, the human ear ossicle is similar to the fish jaw bone.  This is a picture of salmon to represent the fish jaw bone.


K-strategists are organisms that produce small numbers of offspring at a time and protect their young. Dogs, like my friend’s dog,  are K-strategists

Introduced Species

Introduced species are species that humans have placed into an ecosystem or community, accidentally or intentionally, in which it doesn’t naturally occur. This is a picture of a  tree in my neighborhood which was planted there by the homeowners association.


A heterotroph is an organism that derives its nutritional requirements from complex organic substances. All animals such as my friend’s other dog are heterotrophs.


Glycogen is a substance deposited in body tissues as a store of carbs. Glycogen is found in human muscles, like the ones demonstrated by my little brother  in the picture.


A frond is the leaf or leaflike part of a palm or fern. This is a picture of a fake palm tree. The green leaflike parts are its fronds.

Epithelial Tissue

Epithelial tissue is the membraneous tissue covering internal organs and other internal surfaces of the body. This is a picture of my little brother’s leg which is covered in this tissue.


An endotherm is an organism that generates heat to maintain its body temperature. All mammals, such as cats, are endotherms.

Cellular Respiration

Cellular respiration is the metabolic process in which certain organisms obtain energy from organic molecules. Plants such as this flower go through cellular respiration.


An autotroph, or producer, is an organism that produces complex organic compounds from simple inorganic molecules using energy from the photosynthesis or chemosynthesis. This is a picture of an evergreen tree which is an example of an autotroph.

Bilateral Symmetry

Leaves have bilateral symmetry which means that they have a basic body plan in which their left and right sides can be divided congruently.


This is a bee. Bees travel from flower to flower spreading pollen, which is a powdery substance produced by the anthers that fertilizes the flowers.

Asexual Reproduction

This is a fake flower from my room. Real flowers  reproduce asexually, which means that one individual produces offspring that are genetically identical to itself.

Animal that has a segmented body

This is an ant which I found in my kitchen. An ant has a segmented body, which is a body divided into segments that are often grouped into larger functional units. The ant is in the lower right corner of this picture on the white tile.