Refer to the figure below showing life's "timeline."
Based on the timeline, which statement is true?
A) The oldest fossils include photosynthesizers.
B) The first photosynthesizers were prokaryotic.
C) Multicellularity arose before the evolution of eukaryotic cells.
D) The oldest fossils include multicellular organisms.
E) The first photosynthesizers were multicellular.

Question

Refer to the figure below showing life's "timeline."  
Based on the timeline, which statement is true?
A) The oldest fossils include photosynthesizers. 
B) The first photosynthesizers were prokaryotic. 
C) Multicellularity arose before the evolution of eukaryotic cells. 
D) The oldest fossils include multicellular organisms. 
E) The first photosynthesizers were multicellular.

Quizplus · Accepted Answer

The timeline shows that the first photosynthetic organisms were prokaryotic, indicated by the appearance of stromatolites (3.5 billion years ago). The timeline also shows that eukaryotic cells evolved later (2.7 billion years ago), and multicellularity evolved even later (1.2 billion years ago). Therefore, choices A, C, D, and E are all incorrect.

Refer to the Figure Below Showing Life's "Timeline