Organisms that are classified into different domains may differ in significant ways. For example, all Archaea are single celled, while many Eukarya are multicellular. Which of the following supports the idea that Archaea and Eukarya share common origin, despite differences?

Question

awkwardpanda · Answer

They both are capable of photosynthesis and produce energy?
They both carry out core biological processes, such as reproduction and metabolism?
They can both survive under extreme environmental conditions?
They first appeared on Earth around the same time, according to fossil evidence.

psymon · Answer

I would think the second one. If I recall, the origin of eukaryotes is through endosymbiosis, where one prokaryote basically enveloped another and the envelope prokaryote became a cell within the original host prokaryote. So beforehand, prokaryotes could perform said biological processes and, of course, afterward the new eukaryotes that came about certainly could as well. 

The only reason Iw ould even consider the extreme conditions one is because that is usually the main difference between prokarya and archaea, archaea is basically the same but can survive under extreme conditions. Either way, the one I mentioned is what I would choose.

anonymous · Answer

2ed one.