Which of the following can be used to compare the amount of radioactivity labels dna in two or more samples a. digital balance
b. scintillation counter
c. water bath
d. petri dish

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

What function does a limb serve in each animal how are the limb bones of the four animal similar based on the similarities what can be inferred about the evolution of the poor animals