Answer:
B- economic expansion
Explanation:
When a gdp increases, it's associated with economic expansion according to the business cycle
Maarten Schmidt found the spectral lines were high redshift (had their emission lines shifted toward longer, redder wavelengths by the expansion of the Universe)
<span>The puzzle about quasar spectra, which was finally solved by Maarten Schmidt, was </span><span>the brightest known quasar</span>.
Here are the chronological events:
1. <span>humans survived by hunting and gathering.
2. </span><span>the the neolithic revolution occurred,
3. </span><span>people could farm and store a surplus of food,
</span><span>4. advanced civilizations developed
</span>The advancaement in agricultural technology became the turning point in human history because it allow humans to modify food availability in order to sustain our survival, which lead to massive population growth and safety over period of time.
FDR had polio in his childhood, leaving him paralyzed.
