Which cells are most likely to react in the event that there is a reduction in the supply of oxygen to a person’s foot?
epithelial cells, neurons
neurons, muscle cells
muscle cells, blood cells
blood cells, epithelial cells

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

The body is protected against harmful flu viruses by

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation