A specialized feeding structure in certain invertebrates, consisting of a crown of ciliated tentacles.

A protective external covering, especially in some protists and invertebrates.

Describing flowing water, such as rivers or streams, as opposed to standing water (lentic).

A genus of spiders, including the brown recluse, known for their venomous bites.

A test used to determine the presence of certain chemical groups, such as alcohols or alkyl halides.

A light-emitting molecule involved in bioluminescence, reacting with oxygen to produce light.

A famous Australopithecus afarensis fossil, one of the oldest and most complete hominid skeletons discovered.

Relating to the lower back region of the spine.

The foundational structure of cell membranes, consisting of two layers of phospholipids with embedded proteins.

An immature fat cell that develops into an adipocyte (fat-storing cell).