The middle germ layer in embryos, which gives rise to tissues such as muscle, bone, blood vessels, and the kidneys.

The gelatinous substance found between the ectoderm and endoderm in some invertebrates, such as cnidarians.

A term sometimes used to describe the middle portion of the small intestine, although not commonly used in scientific contexts.

The tissue in the leaves of plants where most photosynthesis occurs, typically containing a high concentration of chloroplasts.

A plant that grows in environments with moderate water availability, neither too dry nor too wet.

A geologic era that lasted from about 252 to 66 million years ago, marked by the rise and fall of dinosaurs, as well as the appearance of the first birds and mammals.

A type of RNA that carries genetic information from DNA to the ribosome, where it is used as a template for protein synthesis.

Abbreviation for metabolism or metabolic, commonly used in biochemical contexts.

A prefix used in chemistry to indicate a specific position of substituents on an aromatic ring, referring to the relative position of groups.

Relating to the chemical processes that occur within a living organism to maintain life, including processes like energy production and nutrient processing.