The early purple bacteria could not survive in oxygen-rich environments. How did the arrival of the green bacteria likely affect the survival of purple bacteria?

Because the green bacteria produced oxygen during photosynthesis, the purple bacteria had a harder time surviving.

Explanation:

Sample Answer

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

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