Where would you expect to find human populations with lighter pigmentations? ( I would really appreciate a explanation with it too )

Select all the correct answers. lactobacillus is a bacteria that live inside humans. these bacteria live on the nutrients from our bodies. they to keep our gut clean and healthy. s. typhi is a bacteria that enter our bodies through contaminated food. this bacteria causes infections in the body. based on this information, which two statements about the association between these bacteria and humans are true? a. lactobacillus shares a parasitic relationship with humans. b. s .typhi shares a parasitic relationship with humans. c. both lactobacillus and s. typhi share a parasitic relationship with humans. d. both lactobacillus and s. typhi share a mutualistic relationship with humans. e. lactobacillus shares a mutualistic relationship with humans, and s. typhi shares a parasitic relationship multiply chrse

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?