Answer:
c. decaying plant and animal remains
Peptidoglycan is present in the cell wall of gram-positive bacteria. Bacteria are safeguarded by a robust cell wall comprising peptidoglycan. The layer of peptidoglycan in the cell wall of bacteria refers to a crystal lattice composition produced from linear chains of two alternating amino sugars, that is NAM (N-acetylmuramic acid) and NAG (N-acetylglucosamine). Peptidoglycans is one of the most essential sources of D-amino acids in nature.
The nine major animal phyla in the context of animal phylogeny are Phylum Porifera, Phylum Cnidaria,Phylum Platyhelminthes, Phylum Echinodermata, Phylum Mollusca,Phylum Nematoda,Phylum Arthropoda, Phylum Annelida and Phylum Chordata
<h3>What is animal phylogeny?</h3>
The animal phylogeny is defined as the division of the animal kingdom according to groups which are due to the type of tissue and their various body symmetry.
The type of tissue and body symmetry of the various animals of the nine major animal phyla include the following:
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