Fill in the Blank Questions 37._______ is the field of study in which unique sequences of certain genes are used to identify clusters of related groups. 38.The ability of a sponge cell to identify other such sponge cells is called ______________________. 39.A sponge feeds itself by __________________, drawing organisms along with water into itself for nourishment. 40.The three distinct cell layers that form in an embryo are the ectoderm, _____________________ and ___________________. 41.A ____________________ is an example of a cnidarian. Â Â
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