The issues facing Sub Saharan Africa affect its economic development because it continues to face high poverty rates and long-standing development challenges such as food insecurity and malnutrition, ineffective health and education institutions, and infrastructure deficiencies. They also seem to underinvest in infrastructure. Thats why physical infrastructure across much of the continent is a challenge to productivity, according to the African Development Bank. Some other issues are fiscal crisis, political change, and climate change. Both their domestic and external factors seem to contribute to their poor overall economic performance. Some reasons for that are inappropriate economic policies, inadequate human capital development, and low levels of private investment. Overall they are not a stable continent.
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Although more complex animals like invertebrates and multi-celled organisms began to appear, it was very late compared to the original, simpler organisms for which the Precambrian time is characterized by.
Because Astronomers have well-tested theoretical models that explain how a star evolves over the course of its life as well as well-tested theoretical models that explain how a star evolves over the course of its life.
