*Question*
If exercise has a positive impact on human longevity and reproduction, then human longevity and reproduction are positively impacted by:? Answer choices: - aging - food - nutrients - gene flow - old age - exercise - dying young - reduced heat
**Answer**
exercise

*Question*
If high pressure systems allow sailplane to fly, then what do high pressure systems allow? Answer choices: - water conservation - Veins and arteries. - hydrogen and oxygen - Animal survival - to move people - heat energy - heating liquids - sailplanes to fly
**Answer**
sailplanes to fly

*Question*
If if global warming continues, Earth may no longer be able to sustain life, then global warming most threatens the Earth's ability to do what? Answer choices: - Sustain life - reproduce - Melt polar ice caps - growth - protect them - Resist erosion - to move people - Produce fossil fuels
**Answer**
Sustain life

*Question*
If viruses can cause evolution to occur, then what can cause evolution to occur? Answer choices: - heat - viruses - alleles - pollen - Pesticides - extinction - A computer - animals
**Answer**
viruses