He (thomas edidson) obtained patents in such fields as telegraphy, phonography, electric
lighting and photography. In 1882, he designed the first hydroelectric
plant in Appleton, Wisconsin. In 1879, he and Sir Joseph Wilson Swan (in
England) simultaneously invented similar carbon filament incandescent
light bulbs. Edison improved upon Swan's design and by the end of 1880
had produced a 16-watt light bulb that would last for 1500 hours.
(C) its genetic diversity is very low.
<h3>What is meaning of Extinction?</h3>
Extinction is the final phase of a sort of creature or a taxon—typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to be the moment of extinction.
Determining this point is challenging because a species' potential range may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a period of apparent absence (usually in the fossil record). Estimates place the number of extinct species at over five billion, or more than 99% of all species that have ever existed on Earth.
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During the first 2-3 weeks you will not see any physical signs. Look at your dog's nipples, for if it is pink, that may be an indication. Be sure to observe your dog's body and it's weight.
The answer for 21 I think is false