1.- What do the lines between the phosphate group and sugar base represent?

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

The body is protected against harmful flu viruses by

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?