The evolution of lungs and gills, which developed to serve a similar gas-exchange purpose in distantly related organisms, is an example of what type of evolution?

a. convergent evolution
b. natural selection
c. emergent evolution
d. divergent evolution

A. Convergent evolution

Explanation:

If analogous or structurally different oragns performing similar function.. We call that convergent evolution.

The correct answer is option A, that is, convergent evolution.

Explanation:

The convergent evolution in evolutionary biology refers to the phenomenon in which the organisms that are not closely associated, that is, not monophyletic, autonomously evolve identical characteristics as a consequence of having to amend to ecological niches or identical surroundings.  

For example, the evolution of lungs and gills that serves similar functions in distant organisms is an illustration of convergent evolution.  

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt