If ancient volcanoes gave off the same gases, which gas would have been most helpful in the development of early life-forms that could carry out photosynthesis? A. Chlorine
B. Nitrogen
C. Sulfur Dioxide
D. Carbon dioxide

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.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content