Fireflies flicker and flash as they dart through their mating dances, all the while transforming a lovely summer night into a magical evening. While the bioluminescence that allows these insects to glow and gain the moniker “lightning bugs” creates wonder in humans, it is a not-uncommon feature in the animal world, especially for fish and other marine species.
National Geographic defines bioluminescence as light that occurs from the reaction between two chemicals within a living organism: the compound luciferin and either luciferase or photoprotein. The ability to produce light is not just a flashy feature; bioluminescence can give the animal a competitive advantage. For example, deep-sea vampire squids eject glowing mucus to startle predators, and hatchet fish use light-producing organs to adjust reflections off their bodies, masking themselves to prey who are hunting them from below. Other animals that glow or flash to get ahead at sea and on land include plankton, coral, and glowworms.
For decades, scientists and medical researchers studied bioluminescence in nature and have adapted fluorescent genes as biomarkers for many applications. That is how GloFish found their way into home aquariums across the country.
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Answer:
Among the options given on the question the answer is option C.
rising life expectancy
Explanation:In the early 20th century the United States was experiencing the decline of birth rate. There were many reasons behind this. Like as world war I, the Great depression effect in the economy. But after world war II, USA experienced a great increase in the birth rate during the period of 1946 to 1964. This period is called as the Baby Boom in the history of USA. By the end of 1964, 76.6 million babies were born during the period of baby boom.
There are many reasons behind this massive increase of birth rate. Life expectancy was one of the main reason behind this. The strengthened economical condition of the USA has increased the facilities of the people. As a result couples were more willing to have babies.
Moreover soldiers returned from the world war were given the opportunity of job and social securities.As a result they got married inthe pursue of better and fulfill life. 2.2 millions couple were married in 1946 and most of them were strongly inspired to have baby to accomplish the family.
So it can be said that rising life expectancy was a factor behind the Baby Boom.
