#life
Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased (they have died), or because they never had such functions and are classified as inanimate. Various forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria. The criteria can at times be ambiguous and may or may not define viruses, viroids, or potential synthetic life as "living". Biology is the science concerned with the study of life.
There is currently no consensus regarding the definition of life. One popular definition is that organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can grow, adapt to their environment, respond to stimuli, reproduce and evolve. However, several other definitions have been proposed, and there are some borderline cases of life, such as viruses or viroids.
Abiogenesis is the natural process of life arising from non-living matter, such as simple organic compounds. The prevailing scientific hypothesis is that the transition from non-living to living entities was not a single event, but a gradual process of increasing complexity. Life on Earth first appeared as early as 4.28 billion years ago, soon after ocean formation 4.41 billion years ago, and not long after the formation of the Earth 4.54 billion years ago. The earliest known life forms are microfossils of bacteria. Researchers generally think that current life on Earth descends from an RNA world, although RNA-based life may not have been the first life to have existed. The classic 1952 Miller–Urey experiment and similar research demonstrated that most amino acids, the chemical constituents of the proteins used in all living organisms, can be synthesized from inorganic compounds under conditions intended to replicate those of the early Earth. Complex organic molecules occur in the Solar System and in interstellar space, and these molecules may have provided starting material for the development of life on Earth.Since its primordial beginnings, life on Earth has changed its environment on a geologic time scale, but it has also adapted to survive in most ecosystems and conditions. Some microorganisms, called extremophiles, thrive in physically or geochemically extreme environments that are detrimental to most other life on Earth. The cell is considered the structural and functional unit of life. There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids. Cells reproduce through a process of cell division, in which the parent cell divides into two or more daughter cells.
In the past, there have been many attempts to define what is meant by "life" through obsolete concepts such as odic force, hylomorphism, spontaneous generation and vitalism, that have now been disproved by biological discoveries. Aristotle was the first person to classify organisms. Later, Carl Linnaeus introduced his system of binomial nomenclature for the classification of species. Eventually new groups and categories of life were discovered, such as cells and microorganisms, forcing dramatic revisions of the structure of relationships between living organisms. Though currently only known on Earth, life need not be restricted to it, and many scientists speculate in the existence of extraterrestrial life. Artificial life is a computer simulation or man-made reconstruction of any aspect of life, which is often used to examine systems related to natural life.
Death is the permanent termination of all biological functions which sustain an organism, and as such, is the end of its life. Extinction is the term describing the dying out of a group or taxon, usually a species. Fossils are the preserved remains or traces of organisms.

List of Pinterest Life images & Life pictures

List of all Pinterest Life images and pictures. Browse Pinterest Life ideas

Tuesday Tips & Questions: Volume 14 Tuesday Tips & Questions: Volume 14
Tuesday Tips & Questions: Volume 14 Tuesday Tips & Questions: Volume 14
#questions #questions #tuesday #tuesday #volume #volume #cella #tips #tips #janeTuesday Tips & Questions: Volume 14 Tuesday Tips & Questions: Volume 14 | Cella JaneTuesday Tips & Questions: Volume 14 | Cella Jane
My Goal Is To Build A Life
My Goal Is To Build A Life
Havent for quite some time,, Road trips included with package! ☀️
The Ultimate Guide to Getting Sh*t Done
The Ultimate Guide to Getting Sh*t Done
Sometimes, self growth is simply about adding small improvements to your life. Try out these 16 small ways to assist your personal development journey!
15 Zero-Waste Bathroom Swaps To make Today
15 Zero-Waste Bathroom Swaps To make Today
zero waste bathroom - a greener life Kitchen | kitchenware | Modern Kitchenware | Kitchenware Design | Kitchen Ideas | Kitchen Decor | Eco Friendly Lifestyle #kitchen #kitchenware #modernkitchenware #kitchenwaredesign #kitchenideas #kitchendecor #ecofriendlylifestyle
10 Best Quotes About Life You Need to Read Right Now
10 Best Quotes About Life You Need to Read Right Now
10 of the best quotes on life that everyone should read now. #inspirationalquotesforwomen #upliftingquotesforwomen #confidencequotes #quotesaboutstrength #positivequotes #motivationalquotesforlife #inspirationalquotesaboutlife #inspirationalquotesaboutlove #deeplifequotes #inspirationallifequotes #beautifullifequotes #happylifequotes #lifequotestoliveby #deepquotes
How Much Time Do You Spend On Daily Self Care?
How Much Time Do You Spend On Daily Self Care?
Become a priority in your life quote. Prioritize yourself over low value habits to live a balanced, healthy and successful life. Click pin to see my daily routines plus a list of daily self care rituals (journaling, drawing, beauty regimen, etc) to add to your life! #inspirationalquote #selfcare #prioritzeyourself
Nine Favorite Things.
Nine Favorite Things.
Nine Favorite Things. - Half Baked Harvest
25 Inspirational Quotes To Remind You That Life is Beautiful
25 Inspirational Quotes To Remind You That Life is Beautiful
25 Inspirational Quotes To Remind You That Life is Beautiful
10 Beautiful Quotes To Brighten Your Day
10 Beautiful Quotes To Brighten Your Day
Don't wait for things to get better. Life will always be complicated. Learn to be happy right now, otherways you'll run out of time. #quotes #inspirational#motivational #inspiration #quote
25 Short Inspirational Quotes for a Beautiful Life
25 Short Inspirational Quotes for a Beautiful Life
Trust the timing of your life - Short Inspirational Quotes #quotes #inspirationalquotes // short inspirational quotes, quotes about life, short quotes
25 Inspiring Quotes & Life Lessons To Bring With You Into The New Year
25 Inspiring Quotes & Life Lessons To Bring With You Into The New Year
25 Life Quotes & Inspirational Life Lessons To Live By In 2019 | YourTango
35 Of The Very Best Smile Quotes That’ll Leave You Smiling From Ear To Ear
35 Of The Very Best Smile Quotes That’ll Leave You Smiling From Ear To Ear
Follow @MyLifeAsNae for more quotes! #quotes #quotesoftheday #lifequotes #lifeadvice #wisdomquotes #quotesforyou
Your Guide to Save Money and Make Money
Your Guide to Save Money and Make Money
Quotes about life! Quotes to live by! #quotes #quote
51 Positive and Healthy Habits For an Amazing Life
51 Positive and Healthy Habits For an Amazing Life
51 positive and healthy habits for a better and more amazing life. You are what you repeatedly do, so start today by implementing one or more of the habits on the list. #habits #personaldevelopment
A Satisfied Life Is Better Than A Successful Life
A Satisfied Life Is Better Than A Successful Life
8 Things Most People Take A Lifetime To Learn
8 Things Most People Take A Lifetime To Learn
Don't wait - learn these lessons now. The sooner you do it, the better for your life.
Nine Favorite Things.
Nine Favorite Things.
From the top 4 lessons I've learned from my mom, to some of the coolest Met Galla dresses, to a spring kitchen refresh, to an awesome lip sleeping mask - yes a sleep mask for your lips, to my latest favorite skirts, and this week's dinners...come join Tieghan for another Nine Favorite Things post.
Why I Never Want to Settle Down
Why I Never Want to Settle Down
In the end, you just have to do what makes YOU happy.
35 Happiness Quotes Will Remind You To Freaking ROCK Your Day Today
35 Happiness Quotes Will Remind You To Freaking ROCK Your Day Today
Remember that it's not about the material things. | "It's the little things in life." — Unknown
How To Live With Intent (Even If You're Super Busy & Stressed Out)
How To Live With Intent (Even If You're Super Busy & Stressed Out)
How To Live With Intent (Even If You're Super Busy & Stressed Out) work life balance