-The illustration depicts five types of intercellular chemical signals. What kind of signal does "C" represent?
Definitions:
Mesophyll
Photosynthetic tissue in the interior of a leaf; sometimes differentiated into palisade mesophyll and spongy mesophyll.
Spicule
A small, needle-like structure or particle, made of calcium carbonate or silica, found in sponges and certain other invertebrates, providing support.
Cnidaria
A phylum of aquatic invertebrate animals that includes jellyfish, corals, and sea anemones, characterized by their specialized stinging cells.
Porifera
A phylum consisting of simple, multicellular organisms known as sponges, characterized by their porous bodies and lack of true tissues and organs.
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