Lifes For Living
When the tip of a branch is touched, the leaves on that branch rapidly fold inwards in series, starting with those closest to the touched point. Populations of living organisms can undergo evolution , meaning that the genetic makeup of a population may change over time. In some cases, evolution involves natural selection , in which a heritable trait, such as darker fur color or narrower beak shape, lets organisms survive and reproduce better in a particular environment.
Over generations, a heritable trait that provides a fitness advantage may become more and more common in a population, making the population better suited to its environment. This process is called adaptation. Is this the definitive list?
Introduction
Living organisms have many different properties related to being alive, and it can be hard to decide on the exact set that best defines life. Thus, different thinkers have developed different lists of the properties of life.
For instance, some lists might include movement as a defining characteristic, while others might specify that living things carry their genetic information in the form of DNA. Still others might emphasize that life is carbon-based. Image of a mule on a farm. The mule looks similar to a donkey and is clearly a living animal, despite the fact that it cannot reproduce. For instance, a mule, the offspring of a female horse and a male donkey, is unable to reproduce.
However, most biologists along with everyone else would consider a mule, pictured above, to be alive. A similar point is illustrated in this amusing story: Nonetheless, the list above provides a reasonable set of properties to help us distinguish between things that are alive and those that are not. Separating living and non-living things. How well do the properties above allow us to determine whether or not something is alive? The living things we saw in the introduction—humans, dogs, and trees—easily fulfill all seven criteria of life.
We, along with our canine friends and the plants in our yards, are made of cells, metabolize, maintain homeostasis, grow, and respond. Humans, dogs, and trees are also capable of reproducing, and their populations undergo biological evolution. Nonliving things may show some, but not all, properties of life.
Living things may keep some properties of life when they become nonliving, but lose others. For instance, if you looked at the wood in a chair under a microscope, you might see traces of the cells that used to make up the living tree.
Life And Living Quotes ( quotes)
However, the wood is no longer alive, and, having been made into a chair, can no longer grow, metabolize, maintain homeostasis, respond, or reproduce. It might even maintain homeostasis, with an internal fan or heater that turned on if the temperature changed. However, what if a robot were programmed to add pieces onto itself? To build more robots? As these ideas show, a sophisticated enough computer or robot—far beyond what we have today!
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What counts as life is still being defined. The question of what it means to be alive remains unresolved. For instance, viruses—tiny protein and nucleic acid structures that can only reproduce inside host cells—have many of the properties of life. However, they do not have a cellular structure, nor can they reproduce without a host. Diagram of a virus. The virus consists of a nucleic acid genome inside an external protein coat. For these reasons, viruses are not generally considered to be alive. However, not everyone agrees with this conclusion, and whether they count as life remains a topic of debate.
One day is equal to all days. There is no other light, no other night. This sun, this moon, these stars, the way they are arranged, all is the very same your ancestors enjoyed and that will entertain your grandchildren. And at worst, the distribution and variety of all the acts of my comedy runs its course in a year. If you have taken note of the revolution of my four seasons, they embrace the infancy, the youth, the manhood, and the old age of the world. It has played its part. It knows no other trick than to begin again. Louvre Museum, Paris, France. The advantage of living is not measured by length but by use; some men have lived long and lived little; attend to it while you are in it.
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It lies in your will, not in the number of years, for you to have lived enough. Did you think you would never arrive where you never ceased going?
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Yet there is no road but has its end. And if company can comfort you, does not the world keep pace with you? You have seen enough men who were better off for dying, thereby avoiding great miseries. Have you found any man that was worse off? Everything and everyone that you hate is engraved upon your heart; if you want to let go of something, if you want to forget, you cannot hate. Too much of the time, we are blinded by our own pursuits of people to love us, people that don't even matter, while all that time we waste and the people who do love us have to stand on the sidewalk and watch us beg in the streets!
It's time to put an end to this. It's time for us to let ourselves be loved. So let them go, let go of them.
I tie no weights to my ankles. And I have trained myself to love it.
Biology and the scientific method
Because it is only when we are suspended in mid-air with no landing in sight, that we force our wings to unravel and alas begin our flight. And as we fly, we still may not know where we are going to. But the miracle is in the unfolding of the wings. You may not know where you're going, but you know that so long as you spread your wings, the winds will carry you. The only way that we can grow is if we change.
The only way that we can change is if we learn. The only way we can learn is if we are exposed. And the only way that we can become exposed is if we throw ourselves out into the open.