What are possible causes of cystic fibrosis? Select all that apply.

the existing CFTR proteins being too aggressive at their job
CFTR proteins not being produced or functioning properly
too many CFTR proteins being produced by cells
a faulty CFTR gene

Which is an idea that einstein introduced in his theories of relativity? a.) space is made up of three dimensions. b.) space and time are separate and distinct entities. c.) space-time bends due to the masses in the universe. d.) gravity is caused by a force of attraction between two masses.