"a student filled a dialysis tube with 97% water solution and sealed the ends. the tube and its contents had a mass of 55 grams. the student placed the tube in a solution, and the mass of the tube and its contents increased to 60 grams. into which solution was the dialysis tube placed?
(1)0% water
(2)95% water
(3)97% water
(4)99% water"

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Lucia is walking barefoot in her yard. she accidentally steps on a nail. how will her nervous system work to generate a reaction? arrange the eventschronologically.