Why would evidence of cholera in people living side by side, differing only in water supply, provide critical evidence ?

Y’all i need answers plss people are saying me and my brother look alike although we’re two different ages. one year apart i’m a girl, btw i’m thinking we could be fraternal twins idk my parents and my friends think we look alike

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Which anatomical plane is the only one that could not show both the sternal region and vertebral region