What is the most valid conclusion based on the data?The water in the ocean gets warmer as the salinity increases. Higher salinity at shallow depths prevents the ocean from freezing. Low concentrations of salt in the deep ocean keep the water cold. Salinity is less stable at shallower depths than at deeper depths.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.