Cystic fibrosis is caused by a mutated gene that produces a defective enzyme in the secretory cells. which statement correctly describes its treatment interventions? a) regular exercise to control blood cholesterol b) use of vaccines to increase the number of t cells c) insulin injections to transport sugar out of the blood d) antibiotics to cure lung damage caused by thick mucus infection

D

Explanation:

This mutation affects these secretory cells and causes them to secrete a thick secretion (rather than the normal 'thin' kind) hence they clog up ducts, pores, and tubes. This is how even the lungs are affected causing wheezing and breathlessness. It gest worse when the mucus accumulates infectious bacteria.

i would say it is

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.