1) According to principle of parsimony, evolution of four-chambered heart must placed birds and mammals in similar clade. Describe why does most accepted evolutionary tree show them as separate branches from reptilian line?
2) First appearance of free oxygen in atmosphere triggered the massive wave of extinctions among prokaryotes of the time. Describe why in detail. Describe the reason behind statement " Evolution is not goal or oriented?
3) Portion of the ancient skeleton has been uncovered in Asia. As the skull is missing, discoverers can’t find out whether skeleton is from the human or some kind of ape. Only portions that excavators have been able to determine are pelvis and one complete leg. What must they look for?