They would not be able to fit into a semipermeable membrane it will just pass threw
The theme is the writer's view of or comment about the subject. The answer to your question is D. I hope this is the answer that you are looking for and it comes to your help.
The correct answer is marsupials.
<span>Marsupials are any members of the mammalian class Marsupialia and are endemic to Australasia and the Americas. The main characteristic common to these species is that most of the young are carried in a pouch because they give birth to relatively undeveloped young. Examples of marsupials include kangaroos, wallabies, koalas, possums, opossums, wombats, and Tasmanian devils. </span>
Convergent evolution suggests different organisms evolved similarly due to similar environments.
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