Which of the following MOST influenced the growth in the human population over the last century?
(A) Farmers have developed new crops that can grow in various climates and with small nutrient input.
Mechanical and chemical technologies have been developed to greatly increase agricultural production.
(C) The development of chemical fertilizers has enabled farmers to grow more intensive staple crops.
(D) Access to new freshwater resources has greatly expanded the use and efficiency of irrigation systems.

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.

As a small change in a person's dna can cause a genetic disorder

What is turgor pressure, what causes it, and what does it do for a plant?