Which of the following is an incorrect statement about vaccines?
a. vaccines are weakened forms of the pathogen that you are defending against. b. vaccines you build up immunity against a certain pathogen. c. a vaccine will allow a person’s body to recognize the pathogen later on. d. vaccines are usually harmful and should not be taken.

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

What makes a dominant allele different from a recessive allele

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.