in Bacteria Kingdom by

1 Answer

0 votes
by
Chemoautotrophs were the first organisms to exist on earth because they used the chemical energy around them to make food

It can't be chemoheterotrophs as there was no food on earth at that time
Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.
...