tension at the surface of a body of liquid that prevents the molecules from separating; created by the attractive cohesive forces between the liquid's molecules

detergent-like liquid in the airways that lowers the surface tension of the alveoli to allow for expansion

graph of the number of surviving population members versus the relative age of the member

part of the growing embryo that makes connection with the maternal tissues

small, flat, irregularly shaped bone that forms between the flat bones of the cranium

short fiber of connective tissue that holds the skull bones tightly in place; found only in the skull

in fishes, a gas filled organ that helps to control the buoyancy of the fish

close interaction between individuals of different species over an extended period of time that impacts the abundance and distribution of the associating populations

division of autonomic nervous system activated during stressful “fight or flight” situations

speciation that occurs in the same geographic space

hyaline cartilage covers the end of the bone, but the connection between bones occurs through fibrocartilage; symphyses are found at the joints between vertebrae

transporter that carries two different ions or small molecules, both in the same direction

junction between two neurons where neuronal signals are communicated

mammal having one temporal fenestra

formation of a close association between homologous chromosomes during prophase I