What is the role of gills?
a. to pump blood
b. to bring oxygen into the animal
c. to break up food
d. to be a body cavity

The influenza virus cause the flu, but not other diseases. why?

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

What advantages does a pedigree have over a written passage?