Answer:
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Hope this helps.
Nails form from molten iron is considered a Physical change. Why? The molten iron is just heated in order to form a different shape which is the nail but its chemical composition is still the same. The chemical composition of the nail is still the same with iron.
1. Stars last forever
2. Nuclear fusion
3. Space
4. Name
5. D
6. B
7. C
8. A
The phenomena of polygenic inheritance would have become a grievous fault to his investigation, if he had investigated human height instead of stem length of pea plants.
Explanation:
The polygenic or polygenetic inheritance is the inheritance where the trait of a particular allele is passed on to the next generation with many genes involved in order to show the genotype and phenotype of the allele present on the same chromosome.
The stem length or plant height depends on the single factor of allelic gene inheritance and expression in phenotype, making it simpler to trace down the division of meiosis and control the experiment as needed. Considering human height for a chance, may lead to uncontrolled condition of having next generation study as well as the time required to be long. Other factor was that the height is dependent not only on the height gene expression but is controlled by nutrition and environmental factors too.
<span>The proteins that are embedded in the cell membrane act as channels to transport substances in and out of the cell.</span>
