African lungfish, which are often found in small, stagnant pools of fresh water, produce urea as a nitrogenous waste. what is the advantage of this adaptation?
a) urea takes less energy to synthesize than ammonia.
b) small stangnant pools do not provide enough water to dilute the toxic ammonia.
c) the highlt toxic urea makes the pool uninhabitable to potential competitors.

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geological equipment to analyze the composition of rock?