What kind of new therapies are scientists working on to treat cystic fibrosis? Select all that apply.

A - gene therapies to fix the CFTR gene
B - gene editing to remove the CFTR protein
C - injections to add water directly to the mucus
D - inhalers to deliver CFTR to the cells

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?