Answer:
Mutation
Explanation:
A mutation can be described or explained a change that occurs in the DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors.
This means that the occurrence of Huntingtons disease in high frequency is because of mutation. This is possible because during the settlement of the dutch in 17 the century in South Africa, they might had intercourse with the people that have the disease and inherited it. And they will be transferring the gene with the trait of the disease from one person to another through sex. And this will result to high number of the disease in their population.
The answer as far as I can tell is B). Everything else is silly lol.
Answer: Yes
Explanation: In order to go to the right end you must be searched first anyone tells you otherwise.
The answer is septum.
Frog hearts have 3 chambers - one ventricle and two atria. The left atrium receives oxygenated blood, and the right atrium receives deoxygenated blood and they both empty into the ventricle. Since there is only one ventricle, oxygenated and deoxygenated blood will mix. If there would be a septum in the ventricle, similar to those in lizards, less mixing will occur. Anyway, in frog's ventricle, there is a ventricular fold that prevents complete mixing of oxygenated and deoxygenated blood.