Answer: A, a structure that has no use in the organism
Explanation:
A vestigial structure is an anatomical feature that no longer seems to have a purpose in the current form of an organism of the given species.
Thermodynamics, the laws of gravitation
I can conclude about this microbial agent that it is gram-negative. They are bacteria.
<h3>What are gram-negative bacteria?</h3>
Gram-negative bacteria are a group of microbes that have a thin peptidoglycan cell wall.
Conversely, Gram-positive bacteria have a thick peptidoglycan coating, composed of around 30 layers of peptidoglycans.
The gram-negative bacteria include different microbial agents such as <em>Pseudomonas aeruginosa, Chlamydia trachomatis, Escherichia coli, </em>and <em>Yersinia pestis.</em>
Learn more about gram-negative bacteria here:
brainly.com/question/1194544
Isotopes are atoms with the same atomic number but different atomic weights. Atoms of different isotopes are atoms of the same chemical element. They differ in the number of neutrons in the nucleus.
