In the 1880s, Louis Pasteur developed a method of weakening viruses. The weakened viruses could be injected into healthy individuals. How is this method effective in fighting viral diseases? * 1.The immune system develops antibodies in response to the weakened viruses.

2.The weakened viruses attach to unaffected viruses in the host and interrupt the viral reproductive cycle.

3.The rate of genetic mutation in the host is decreased due to the introduction of weakened viruses

4.Weakened viruses are unable to enter the host organism.

Me! eve and sammy are discussing the affects of farming on the environment. eve states that farming does not harm our environment. she believes that it is only beneficial for the ecosystem and species living in it. sammy states that farming can have major impacts on the environment. he believes farming can cause habitat loss. who is correct? question options: eve is correct because farming only leads to positive affects on ecosystems. sammy is correct because farming has major affects on the environment including soil erosion and flooding. eve is correct because farming does not lead to soil erosion and flooding. neither of them are correct.

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

What causes darkening of the skin as melanin production increases