Examlex
________ is an experiment in which neither the subjects nor the individuals running the experiment know if subjects are in the experimental or the control group until after the results are tallied.
Spicules
Small, spike-like structures found in various organisms, such as sponges and some animals, serving as structural supports or defense mechanisms.
Invertebrate Animals
Animals lacking a vertebral column, including species such as insects, mollusks, and crustaceans.
Protistan Ancestors
Refers to the early eukaryotic organisms from which modern protists, and indirectly all eukaryotic life, are believed to have descended.
Cnidarians
A phylum of aquatic animals that includes jellyfish, corals, and sea anemones, characterized by a simple body structure with a single opening and a body wall made of two layers of cells.
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