Question

1st life on earth was (a) cyanobacteria (b) chemohetrotrophs (c) autotrophs (d) photoautotrophs.

1st life on earth was

(a) cyanobacteria

(b) chemohetrotrophs

(c) autotrophs

(d) photoautotrophs.

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Answer #1

Option b is correct

Explanation: The first living beings were procaryotic, like bacteria. They were single-celled. The nucleic acid core consisted of naked DNA. These living beings were present in the environment of the soupy sea having abundant organic molecules.

Nutritionally they were chemoheterotrophs. They absorbed the organic materials from outside both for bodybuilding and liberation of energy. Respiration was anaerobic since free oxygen was absent in the environment.

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