Question

3 how did bacteria make complex life on earth possible? a by releasing oxygen into the atmosphere b by destroying life - inhibiting volcanoes c by evolving rapidly into multi - celled organisms d all of the above

Explanation:

Early bacteria, like cyanobacteria, performed photosynthesis and released oxygen into the atmosphere through the process of oxygenic photosynthesis. This oxygen - rich atmosphere was crucial for the evolution of more complex aerobic life forms. Bacteria did not destroy life - inhibiting volcanoes, and the evolution from bacteria to multi - celled organisms was a long and complex process, not a rapid one.

Answer:

A. By releasing oxygen into the atmosphere