Prokaryotes do not obtain organelles by endosymbiosis because they lack

ocean expansion, global warming is melting icebergs and causing water levels to rise.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

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human impact on the environment can be seen in the deterioration of the !

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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.