A connection or joining between two structures, such as in the brain where commissures link the two hemispheres.

A group of interacting organisms of different species living in the same area or environment.

A type of plant cell that works closely with sieve-tube elements to transport materials in phloem tissue.

A scientist who studies the anatomical structures of different species in order to understand their evolutionary relationships.

The study of similarities and differences in the anatomy of different species to infer evolutionary relationships.

A multinucleate cell formed by the repeated division of the nucleus without corresponding cytokinesis, often found in fungi and algae.

A non-protein compound that is necessary for the functioning of an enzyme, often involved in metabolism or other biochemical processes.

A coenzyme that plays a key role in the metabolism of fatty acids and carbohydrates by assisting in the transfer of acyl groups.

The process by which two or more species influence each other’s evolution, often through mutualistic or antagonistic interactions.

A non-protein molecule or ion that assists an enzyme in its activity, often by facilitating the enzyme’s catalytic reaction.