Bacteria coat our skin, gut, and mouth. Also present are protists, archaeans, and viruses. Collectively, these organisms are our microbiota. For most members of our microbiota, our body provides their environment, or space, to live. They, in turn, have no effect on us. This is an example of:
A. an antagonistic relationship.
B. mutualism.
C. predation.
D. commensalism.

D

Explanation:

Commensalism :

1. Is the relationship between two different species in which one species get food or other type of benefits from other species, and in return other,the species is neither benefit nor harmed, it remain unaffected.

2. A commensal species benefits from another species by various ways like obtaining locomotion, shelter, food, or support from the host species, which neither benefits nor is harmed.

3. Example: The remora rides attached to sharks and many other types of fish.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein