Problem:
When trying to determine the endosymbiotic origin of a chloroplast, what evidence would lead you to believe each of the following:
(Its not a multiple choice question. How can I prove each option?)
a) primary endosymbiotic event only
b) secondary endosymbiotic event in which the endosymbiont is a green alga
c) secondary endosymbiotic event in which the endosymbiont is a red alga
d) secondary replacement
Give reasoning with your answer.