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Recent work in classification of life on Earth has shown that what were once called prokaryotes are much more diverse than ever suspected. The prokaryotae are now divided into two domains, the Eubacteria and the Archaeabacteria, as different from each other as either is from the Eukaryota. No one of these groups is ancestral to the others, and each shares certain features with the others as well as having its own unique characteristics. One group of prokaryotae, the blue-green algae, have left a fossil record that is dated to be nearly 3.5 billion years old, among the oldest fossils currently known. These blue-green algae had cell walls and were photosynthetic. Considering this, where would you place the cyanobacteria in this cladogram?

A) archaebacteria
B) eubacteria
C) plantae
D) protista

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For Future K12 Students, its Eubacteria

Answer: The correct answer is -

B) eubacteria.

Cyanobacteria (also known as blue green algae) are the 'true bacteria' (prokaryotes that is they are devoid of nucleus and membrane bound subcellular compartments such as mitochondria, endoplasmic reticulum, golgi complex).

They belong to the domain Eubacteria (true bacteria).

They have left a fossil record that is dated to be nearly 3.5 billion years old, which supports the origin of different life forms from cyanobacteria.

Thus, B) option is the right answer.

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