What is the name of the mucous membrane that lines the eyelids and covers the front of the eye?

Consider this plant cell which organelle is labeled g

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.