Cystic fibrosis is caused by a defect in a single gene what specifically does the gene code for? A. The production of mucus
B. The airways that lead to the lungs
C. Proteins that make up red blood cells
D. Proteins that carry chloride ions across the cell membrane

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The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

Which of the following typically characterizes a tropical rainforests