Ans.
HD (Huntington's disease) is a genetic neurological disorder that occurs due to damage and death of brain cells. it is caused by an autosomal dominant mutation in HTT (huntingtin) gene, having a trinucleotide repeat section that makes HTT protein.
The mutation leads to an increase in this nucleotide repeat count, associated with formation of altered or mutated huntingtin protein. These altered proteins show deleterious affect on brain cells and result in Huntington's disease.
Thus, the correct answer is 'option A). a mutated gene.'
Deep canyons, steep cliffs, rugged mountains. Dry, rocky environment. Little rainfall so few trees. Influenced the kinds of homes built. (Used stones, mud, bricks, etc.)
Farming methods.
D: The population will increase, but it will eventually decrease because the prairie dogs will eat all of the grass , which will cause for them to starve. I suggest going with d, hope this helps!
Answer:
They are present in all living organism
Fish don't have ears we can see but they have ear parts inside their heads. They pick up sounds in water through their bodies.