The Cause of Cystic Fibrosis 1. Cystic fibrosis is caused by a defect in a single gene. What
specifically does the gene code for?
O A. the production of mucus
B. the airways that lead to the lungs
OC. proteins that make up red blood cells
D. proteins that carry chloride ions across the cell
membrane
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Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

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Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.