Arthropod
one of a group of invertebrate animals with jointed bodies and limbs that includes insects, spiders, scorpions, mites, and centipedes (A4, C4)
Anchialine pond
a brackish or saltwater pool with no surface connection to the ocean (C3)
Adaptation
a change in an organism or species that enables it to survive in a particular habitat (A3, C3, R3, M2, M3)
Active beach
that part of a beach that is constantly changing (C1)