Which of the following substances are common allergens?

Which of the following substances are common allergens?
 
  a. Fungal spores
 b. Dust mites
 c. All of these choices.
 d. Pollen
 e. Bees

Question 2

Water constantly enters the cells of a freshwater sponge by osmosis. How is the sponge adapted to handle this problem?
 
  a. Contractile vacuoles expel fluid to the outside of each individual cell.
 b. Action of cilia in flame cells drives interstitial fluid into tubes, then out of pores at the surface.
 c. Extra water and wastes are transported into Malpighian tubules that route them out of the body.
 d. Water is excreted through tubular excretory organs called nephridia.