Organizing geologic time: Scientists have organized the earth’s history into four major eras: Precambrian Era (earliest forms of life, such as bacteria and blue-green algae; later in the period, invertebrates such as jellyfish)
Standard detail
7.S.IV.B.2
Depth 2Parent ID: D28EDF29F237467CBB7EDA01E105FDECStandard set: Seventh
Original statement
Quick facts
- Statement code
- 7.S.IV.B.2
- List ID
- 2
- Standard ID
- CD6AA4AE037A4DA7B0D4594FED99F4A9
- Subject
- Science
- Grades
- 07
- Ancestor IDs
- D28EDF29F237467CBB7EDA01E105FDEC3778BC06322948AEA2C153E04779A4AF
- Source document
- Core Knowledge
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- CC BY 4.0 US