<span>When the molecules in a solid are heated (heat is the same as molecular movement) they move faster due to the energy gain and when they have enough energy they can overcome the attraction they have between each other and break their bonds to form a liquid, and if heated further a gas.</span>
Answer:
use electricity to make a spark in the bulb and light it
Explanation:
Ans.
Sickle-cell disorder shows defected red blood cells, due to mutation in gene that code for hemoglobin. The mutated genes for sickle-cell disease are found in higher percentage of sub-Saharan African population as it provides protection against malaria as compared to population of United States.
Malaria is common in sub-Saharan Africa region and there, natural selection favored gene for sickle cells, because it might be beneficial to people having sickle cell disease that makes them able to survive in such condition and transmit their genes to offspring.
On the other hand, in those Africans, who moved to United States, where malaria is uncommon or absent, natural selection favored normal, wild type genes, resulting in fewer people with defected sickle cell.
Thus, the evolutionary process behind this is 'natural selection.'
