The answer indeed has to do with similarities between genes coding for proteins involved in adherence and attachment in choanoflagellates and animals. Let me explin it to you a little further. Choanoflagellates are a group of protists. There is Morphological Evidence that can explain how close these protists are as closing living relatives to animals. Not only is morphological evidence the ones that help to conclude that but also molcular evidence. The choanoflagellates are a group of <span>of free-living unicellular and colonial flagellate eukaryotes. </span>
Ribosomal RNA (rRNA) associates with a set of proteins to form ribosomes. These complex structures, which physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. They also bind tRNAs and various accessory molecules necessary for protein synthesis.
There are 7 life processes: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition. You would need at least four or five characteristics to consider if an organism is living, mainly movement, respiration, growth, reproduction, and nutrition. (I might be wrong)
