What are possible causes of cystic fibrosis? AR
Select all that apply.
too many CFTR proteins being produced by cells
a faulty CFTR gene
the existing CFTR proteins being too aggressive at their job
CFTR proteins not being produced or functioning properly

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.