I believe the answer is: <span>experienced crawlers & experienced walkers
</span>both of these groups spent the majority of their time exploring the environment around them through crawling or walking.
Because of this, their body got used to the amount of distance that they could took in one movement and understand if a distance is too large to cover within one movement.
The answer is b. Hope this helps
That's easy ....it's the sec. one
From the peak of the housing bubble in Q2 of 2006, to the trough in Q1 of 2009, the Case-Shiller housing price index fell by just over <em><u>30%</u></em>. U.S. Stock prices (as proxied by the DJIA) fell by <em><u>50%</u></em> from October 2007 to March 2009.