Which of the following scenarios is representative of parasitism? a.
Tapeworms living in a mammal’s intestinal tract
b.
Remora fish attaching themselves to sharks
c.
Birds feeding on insects stirred up by grazing animals
d.
Birds eating scraps of food from a crocodile’s teeth

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

thats not even an aswer choice

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layer 3 is younger than layer 6.