In 3–5 sentences, 1) describe in which population you'd expect to see more adaptations for salt water and 2) explain how such adaptations would become more common in this population.
1) The population in which you would expect to see more adaptations for salt water is the population of organisms living in marine environments such as oceans or seas. These environments have high salt concentrations, so organisms inhabitating them would need specific adaptations to survive and function properly in such conditions.
2) Adaptations for salt water can become more common in a population through a process called natural selection. In this process, individuals with traits that allow them to better tolerate or live in salt water environments are more likely to survive and reproduce successfully. Over time, these individuals pass on their advantageous traits to their offspring, gradually increasing the prevalence of these adaptations in the population. This leads to a population that is better suited to survive and thrive in salt water habitats.