Complete the following reaction by filling in the correct reagents. 
Definitions:
Lancelets
Lancelets are small, blade-like marine animals belonging to the subphylum Cephalochordata, exhibiting key characteristics of chordates, such as a notochord and a dorsal nerve cord.
Microscopic Plates
Tiny, often mineralized structures observable under a microscope, which can be part of the skeletal system of some organisms.
Holothuroidea
A class of marine invertebrates within the phylum Echinodermata, commonly known as sea cucumbers.
Endoskeleton
An internal support structure of an organism, typical of vertebrates, providing physical support and protection for the body.
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