A group of protists characterized by the presence of a shell or test, often found in marine environments.

Male reproductive organs that produce sperm and hormones, such as testosterone.

The male reproductive gland that produces sperm and testosterone.

The final stage of mitosis or meiosis during which the chromosomes decondense and the nuclear membrane reforms.

The stage in meiosis I where the chromosomes reach the poles, the nuclear membrane reforms, and cytokinesis occurs.

The final stage of meiosis II, where the chromosomes reach the poles, the nuclear membrane reforms, and the cells divide…

The terminal segment of the abdomen in some arthropods, such as crustaceans, often bearing sensory or defensive structures.

Short for transmission electron microscope, a type of microscope that uses electron beams to view objects at a very high…

A measure of the thermal energy or heat present in a system, influencing the rate of chemical reactions and biological…

A type of bacteriophage (virus that infects bacteria) that can integrate its genome into the host bacterial chromosome and remain…