Question

First life on earth was
(a) Cyanobacteria
(b) Chemoheterotrophs
(c) Autotrophs
(d) Photoautotrophs

Answer 1

Answer:

autotrophs

Explanation:

because there was no other way of getting food except autotrophic nutrition

Answer 2

(b) Chemoheterotrophs

Explanation:

According to actual evidence, the first simple organism appeared on earth was about 3.8 billion years ago. Initially they are chemoheterotrophs in the environment of sea, as a carbon source they used carbon dioxide and oxidized organic substrate to extract energy from the sea. They absorbs organic material for the sake of nutrition. chemoheterotrophs are anaerobe. Therefore, first life on earth was chemoheterotrophs.