It is commensalism since it benefits the species and leaves the other unharmed.
Answer: Option D.
Whether their cell walls have a thin or thick layer of peptidoglycan.
Explanation:
Gram positive bacteria have thick cell wall layer of peptidoglycan and their cells stain purple when subjected to gram staining which is crystal violet. Examples are anthrax bacteria, diphtheria e.t.c.
Gram negative bacteria have thin cell wall layer of peptidoglycan and tend to retain the color when stained with crystal violet or gram staining. Examples are E.coli, pseudomonas aeruginosa e.t.c. Gram staining is important to differentiate between gram positive from gram negative bacteria.
Answer:
When Kelly drew the diagram, the area marked Y -which includes cast and print- involves mold filling minerals and sediment (option D).
Explanation:
A fossil is the evidence found of an organism that lived many years ago, and consists of organic remains - such as bones - or impressions that remained in the soil.
The fossil record of a living being occurs when it dies and its remains, which are buried, when decomposing leave an impression. This impression - as a mold - is subsequently occupied by minerals and sediment that describe the approximate form of the organism.
In the Kelly diagram, the <u>area labeled Y shows not only the impression of the organism that was found, but also the minerals and sediments that were responsible for filling said mold</u>.
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