Which of the following is NOT an appropriate topic to study using the scientific method?

Which sequence is most correct in the scientific method?  

Which body structure or cell type secretes antibodies?

Which sequence is most correct in the scientific method?  

Which of the following is NOT an appropriate topic to study using the scientific method?

Skin and mucous membranes are important components of the nonspecific first line of defense.

Refer to graph (b): According to this species-area curve for reptiles and amphibians on an              island in the West Indies, how will the number of species living in the area change if the             original area was decreased from 100% to 50%?  

Which of the macromolecules, common to living things, are types of sugars?

Which cells boost the immune response of B and T cells?

Which cells boost the immune response of B and T cells?