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

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

answer; a male inherits only one allele of the x-linked gene controlling hair color;