<u>D.) Crossing over</u> is a source of genetic variation that involves the swapping of sections of chromosomes during meiosis.
<u>Answer:</u>
<em>The biologists clarify these similarities as a homologous pair. This is based on the principle of convergent evolution.</em>
<u>Explanation:</u>
<em>Convergent evolution</em> is understood by the phenomenon of development of similar organs in different species in different period. Those<em> homologous pair </em>have same structure but can have different function in the different <em>species of organism. </em>
The bone of human arms, wings of the bat and dolphin flippers contain many of same bones which have developed from the same embryo tissue but the function for each is <em>different in different species.</em>
This would be 7. Below 7 is acidic and above is basic. 7 is neutral
lungs or ribs that separate the two upper chambers from each other
