HELP ME ASAP A stray dog is brought into Destiny's clinic. The poor thing is eaten up with fleas, and she can see that it has terrible sores on its stomach. After giving the dog topical medication to kill the fleas, she also prescribes antibiotics to kill the bacteria in the sores. Which sentence BEST explains how these bacteriI were able to infect the poor dog?
A. The bacteria were epiparasites that were living inside the fleas and then transferred to the dog when the fleas bit him.
B. The bacteria were left behind when the fleas hatched from their eggs and embedded into the dog's skin.
C. The fleas' bites caused itching, leading the dog to scratch the skin and break the surface, providing a home for bacteria.
D. The antibiotics are being given to kill the bacteria, which is the larval stage of the fleas.

Salmonella typhimurium is a food-borne bacterial pathogen that can cause severe gastrointestinal disease. salmonella is often phagocytosed by macrophages that normally destroy bacterial pathogens, but this bacterium is somehow able to prevent the complete maturation of phagolysosomes. salmonella is able to tolerate the low ph of phagolysosomes, and in fact responds to the drop in ph by secreting toxins that interfere with other cellular responses. which of the following differences would you expect to contribute to the survival of a bacterium within an salmonella-containing phagosome, compared to a healthy phagolysosome? decreased activity of acid hydrolases increased activity of acid hydrolases decreased import of h+ ions increased import of h+ ions my guess is decreased activity of acid hydrolases but i'm not sure.

Consider the diagram below, which represents components of the biosphere. what do the two arrows in the diagram most likely represent? a. radiation b. photosynthesis c. cellular respiration d. energy conversions will give to anyone who answers quickly

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.