The map shows the allele frequency of sickled hemoglobin (hbs) and malaria endemicity in africa. (picture below) which statement best explains the relationship between hbs allele frequency and malaria endemicity in africa? a)when an area is malaria free, the hbs allele frequency is between 0 and 2.02. b)when an area is holoendemic, the hbs allele frequency is between 0.52 and 4.04. c)when an area is malaria free, the hbs allele frequency is between 12.64 and 18.18. d)when an area is holoendemic, the hbs allele frequency is between 0 and 0.51.

Name the type of chemical that speeds up digestion

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

Ascientific idea becomes valid when it is what?