Think about plant evolution and the beginning of photosynthesis.How did this event change animal life on Earth

Answer 1

The development of photosythesis preceded both animals *AND* plants. This was in the form of photosynthetic bacteria (that we now call cyanobacteria ... or (in a misnomer) blue-green algae). These (and other) single-celled organisms were the the only form of life for almost 3 billion years of the earths 4.6 billion year lifespan so far. Multicellular life (including all plants and animals) have only been here for about 1 billion years.

Almost all of the oxygen in our atmosphere is a result of this primordial photosynthesis. Animal life would not be possible without this oxygen.

So photosynthesis didn't just "change" animal life on Earth ... it made animal life *possible*.

Answer 2

You need to think about (or find out about) what the atmosphere on earth was like before photosynthesis, and how the evolution of photosynthesis changed the composition of the atmosphere. That should give you some good things to talk about in terms of how changing the atmosphere affected the evolution of non-plants.

Answer 3

The evolution of photosynthesis preceded the evolution of animal life. As plants are phototrophic and autotrophic, they largely, but not exclusively, make life possible for chemoheterotrophs, which is what animals are. Plants via photosynthesis make the fixation of carbon possible and generate energy using sunlight.

Answer 4

LOL. There was no animal life on Earth at the time.
It's likely that a lot of prokaryotic species went extinct after atmospheric oxygen hit a critical level. It's a mass extinction event, without fossils. LOL.

Answer 5

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