When jenner developed the first vaccine he was using the observation of milk maids who
a. after having cowpox they were immune to smallpoxb. after having chickenpox they were immune to smallpoxc. after being infected with the flu virus they were immune to smallpoxd. after developing hiv they were immune to smallpox

Apart of the periodic table is shown. a portion of the sixteenth and seventeenth columns of the periodic table is shown. column 16 reads eight oxygen, 16 sulfur, and 34 selenium. column 17 reads nine flourine, 17 chlorine, and 35 bromine. which of the following elements is less reactive than the others? bromine (br) oxygen (o) selenium (se) sulfur (s)

Which of the following would be least likely to support the modern concept of biological evolution? ( 2 points) a)different species of organisms with similar bone patterns b)different species of organisms with similar reproductive rates species in c)different domains with similar metabolic pathways species in d)different kingdoms with similar cellular structures.

Which represents a negative impact of technology