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which statements describe how stars are born? check all that apply!

☆ stars are born in clouds of gas and dust called nebulas.
☆ the gas and dust are pulled together by gravity.
☆ if the cloud that is pulled together has enough mass, a red giant is formed.
☆ the pulled-together cloud collapses and becomes hot and dense.
☆ heat and pressure cause nuclear fusion, which signals the birth of a star.

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.