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.
Answer:
D. no sharp line exists between what is normal and abnormal.
Explanation:
The continuum model of normality suggests that normal to abnormal behavior falls along a continuum, hence there is no clear cut difference between what is abnormal and normal. Determining what is normal or abnormal is usually based on subjective judgement. In other words, abnormality and normality are not perceptively different.
Someone can consider an act abnormal based on culture and that same act may be considered normal in another culture.
Answer:
Bears, particularly cave bears, hibernated in the deepest galleries. Some died and their bones were noticed by Paleolithic people when they went underground. ... The charcoal fallen from their torches, their fires, a few objects, bones and flint tools left on the ground are the remains of meals or of sundry activities.
Explanation:
Answer:
The District Administration Office (Nepali: जिल्ला प्रशासन कार्यालय) is a general administration of government in each district of Nepal. The government of Nepal appoints a Chief District Officer in each district to function as a Chief Administration Officer.
<span>The law of conservation of energy states that energy can change from one form into another, but it cannot be created or destroyed. Or the general definition is: The totalenergy of an isolated system remains constant over time. ... A device that demonstrates the Law of Conservation of Mechanical Energy and Momentum.</span>
