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__________________ are small bubbles that may have been the first step in the evolution of cellular structure.
Q5: Biologists currently recognize _ different kingdoms.
Q17: Carbon dioxide is a greenhouse gas.
Q17: Which of the following analyses is not
Q19: The continent of origin for Homo habilis,Homo
Q25: Which animal has a gastrovascular cavity?<br>A) Flatworms,such
Q26: Explain what has to happen to embryonic
Q30: Describe the differences between DNA and RNA.
Q35: Which of the following does not participate
Q52: Amniotic eggs evolved as a means to<br>A)
Q71: Animal phylogenies based on molecular data divide