Question

In the endosymbiotic theory, which type of cell gave rise to animal cells?

	A eukaryotic cell that formed a symbiotic relationship with an aerobic prokaryotic cell only
	A eukaryotic cell that formed a symbiotic relationship with a photosynthetic prokaryotic cell only
	A eukaryotic cell that formed symbiotic relationships with an aerobic and a photosynthetic prokaryotic cell
	A prokaryotic cell that formed a symbiotic relationship with cyanobacteria

Answer 1

According to the Endosymbiotic theory, the eukaryotic cells evolved by having a symbiotic relationship with the prokaryotes. To be precise, the prokaryote cells were able to use oxygen for energy as well as performed photosynthesis. This helped the eukaryotic evolution with the organelles mitochondria and chloroplast.

Therefore, the correct answer is :
A eukaryotic cell that formed symbiotic relationships with an aerobic and a photosynthetic prokaryotic cell