Question

study this image of a geologic time scale. how long ago did invertebrates become common on earth? 1.6 million years ago 132 million years ago 410 million years ago 520 million years ago

Explanation:

Step1: Locate invertebrates in key - events

Find "Invertebrates become common" in the "KEY EVENTS" column.

Step2: Match with time

The corresponding time in the "MILLIONS OF YEARS AGO" column is 520 million years ago.

Answer:

520 million years ago