Why don't invertebrates make up their own clade? What % do invertebrates make up of all animals? help would be nice :)

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All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false

How are primary producers important to the alligator's energy supply