Which event occurs during prophase?

the sister chromatids separate.

the cytoplasm divides.

the spindle fibers form.

the spindle fibers break down.

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.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?