In the list below, which type of cell is involved in adaptive immunity?

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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

Can someone i have no idea of how to do this.