Which statement about the giraffes explains their evolution based on charles darwin’s main points? a) the closest fossil ancestor to these giraffes would have a very short neck. b)all three of the giraffes have an equal chance of reproducing regardless of the environment. c)as a giraffe reached for food, the giraffe could make its neck longer making it better adapted to the environment. d)long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.

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.

The science for classifying and naming organisms is known as

Which of the following terms best matches this definition: the process where humans choose the traits that will be present in the next generation through breeding. question 4 options: genetic determinism artificial selection acquired selection natural selection