Examlex
A foreign key is a column or collection of columns in one table that is required to match the value of the primary key for some row in another table, or be null.
Embryonic Opening
The embryonic opening refers to the blastopore, an early stage in the development of an embryo that can develop into the mouth or anus in different animal groups.
Chelicerates
A subgroup of arthropods that includes spiders, scorpions, ticks, and mites, characterized by the presence of chelicerae, which are claw-like mouthparts.
Crustaceans
Mostly marine arthropods with a calcium-hardened cuticle and two pairs of antennae; for example, lobsters, crabs, krill, and barnacles.
Antennae
Antennae are sensory appendages found on the heads of insects and some other arthropods, used for sensing the environment.
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