The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer, while the crust is the thinnest layer.
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The focal length would be four inches
Answer:
Introducing evasive species to a food web can damage the ecosystem as the existing life depends on each other. Having a new organism come in and take extra food harms the organisms that eat that food, and in turn if there is nothing left from (lets say the carnivores), the producers will have very little nutrients to absorb from the soil. Once the producers die, the herbivores will die because they have no food. Then the chain of death will continue till there's nothing left.
Explanation:
The answer is <span>B) three chromosomes in any one set.
In a human diploid somatic cell (2n), there are 22 chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes (so choice C. does not indicate a genetic problem). There are in total 46 chromosomes (23 pairs in 2 copies), that differs in lengths (so choice D. does not indicate a genetic problem). Speaking of a pair of sex chromosomes, there could be two X chromosomes in females or one X and one Y chromosome in males (so choice A. </span><span>does not indicate a genetic problem).
But, having three chromosomes in </span>any one set suggests a presence of trisomy, which is <span> a condition in which an extra copy
of some chromosome is present. This results in a genetic disorder.</span>
