5) there are currently millions of species of single-celled organisms, and million of others that were once here and are now extinct. which of these would best describe the first, most primitive organism to arise on earth from which all other life evolved? a) unicellular eukaryote b) unicellular prokaryote c) multicellular eukaryote d) multicellular prokaryote

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano