Why do viruses need living hosts, such as bacteria or eukaryote cells? (sb4c) a) the host cell is the source of food for the virus. b) viruses depend on the host cells that they infect to reproduce. c) viruses have a cellular structure which never require a host. d) viruses depend on a host cell because they lack their own dna or rna.

The answer is; B

Actually, viruses are considered nonliving things because they are unable to bear the characteristic of living things (such as respiration, reproduction, growth, excretion, and etcetera) on their own.  They only infect host cells to ride on the cell's biochemical machinery to be able to reproduce. Once outside the cells, they are non-living.  

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.

the answer to your question is tooth decay.