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.  

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

the areas around the equator