Question

Which of the following correctly explains why the first anaerobic organisms on earth are not classified as autotrophs?
Answer

Carbon dioxide was not present on earth at that time.

Chemicals were not available for these organisms to produce their own food.

Oxygen was in abundance and it was more efficient to eat food rather than make their own.

The first organisms did not have sunlight available to make their own food.

Answer 1

@agentscape I keep seeing you help others could you maybe explain this to me?

Answer 2

Oxygen was in abundance and it was more efficient to eat food rather than make their own.

Answer 3

@agentscape thanks so much but can you explain it to me

Answer 4

yes

Answer 5

Anaerobic means without air (“an” means without) right !!. Sometimes there is not enough oxygen around for animals and plants to respire, but they still need energy to survive. Instead they carry out respiration in the absence of oxygen to produce the energy they require this is called anaerobic respiration.
BUT with an (abundance) of oxygen in atmosphere, organisms became more efficient, larger and complex, to eat food rather than make their own energy.

Answer 6

Autotrophs are those organisms that are able to make energy-containing organic molecules from inorganic raw material by using basic energy sources such as sunlight. eg, Green Plants.

Answer 7

That makes sense now thanks so much @agentscape

Answer 8

:), your welcome Ashley!

Answer 9

That's not the right answer. I tried it and it was wrong. The logic behind it seemed solid but it wasn't correct.