As shown in Figure 25.14 below, animals only appear in the fossil record about 580 million years ago, which coincides with atmospheric oxygen levels reaching a threshold needed by animals to breathe. How did the evolution of photosynthetic and heterotrophic organisms change over the last 2 billion years to support the diversity of life seen on Earth today?

Question

As shown in Figure 25.14 below, animals only appear in the fossil record about 580 million years ago, which coincides with atmospheric oxygen levels reaching a threshold needed by animals to breathe.  How did the evolution of photosynthetic and heterotrophic organisms change over the last 2 billion years to support the diversity of life seen on Earth today?

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The Answer of As shown in Figure 25.14 below, animals only appear in the fossil record about 580 million years ago, which coincides with atmospheric oxygen levels reaching a threshold needed by animals to breathe.  How did the evolution of photosynthetic and heterotrophic organisms change over the last 2 billion years to support the diversity of life seen on Earth today?

As Shown in Figure 25