The earliest hominid fossil, “Lucy,” is estimated to be 3.2 million years old. This early human-like species shares an important characteristic with modern humans: bipedalism. Which of the following would favor the selection of bipedal posture over walking on all fours? Bipedal posture allowed for greater mobility in the tree canopy.

Bipedal posture allowed arms to be free to develop and use tools.

Bipedal posture allowed for an increase in hominid brain and jaw size.

Bipedal posture allowed a greater number of offspring to be produced in hominids.

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.

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

Nerve cells are specialized to respond to stimulitrue or false?