The fossil remains of organisms with skeletons are not found in the lowest layers of rock discovered. How is the lack of fossilized skeletons in the lowest rock layers best explained? A. Organisms with skeletons did not evolve until after these rock layers formed.
B. The fossils of organisms with skeletons are only found in the oldest rocks
C. Fossil skeletons are usually crushed if other rock layers are above the ones they are in
D. Organisms with skeletons live only at the highest altitudes, which is where they turn to fossils.

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Ray lo bisects nlm, lm=18, no=4, and ln=10. what is the value of x?

Data courtesy of the un development programme 2006-2008 and world bank 2009 the chart above compares measures of development using the hdi and gdp. why might turkey rank lower in the hdi indicator even though it has a high gdp? a. turkey has a lower gdp than comparable countries in the hdi ranking. b. turkey must increase its hdi to have a higher gdp ranking. c. turkey is only compared to other european countries in gdp, not to the world, as it is in the hdi. d. turkey may struggle to provide adequate education or health care, or it may have a lower life expectancy.