what would happen if all microbes invade from earth planet
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Answer:
it would be not possible but if it will happen so the cycle of nature would disbalance
it would be not possible because we the human being depends on animal and plants for the food and plants depends upon bacteria like leguminous plants peas depends upon rhizobium bacteria for nitrogen fixation in to atmosphere for better growth.
Something terrible would happen if all microbes instantly disappeared.
Centers for Disease Control and Prevention
You can't see them, but microbes are all around us. They live on your skin, in your gut, in your mouth, in the soil. They recycle waste and help plants convert sunlight into energy.
In short, microbes make the world go round. This idea has prompted some researchers to wonder: What would happen if they - the bacteria, fungi, viruses, protists - all disappeared?
The immediate consequences would be dire yet manageable. But things would soon get much worse, and eventually all life on Earth would cease to exist.
Here are the fascinating things that biologists think would happen if all microbes instantly vanished from our planet, based on a study published in the journal PLoS Biology.
Read the original article on Business Insider Copyright 2016
All microbial diseases would vanish.
If you could wave a magic wand and remove all microbes from Earth - all viruses, bacteria, fungi, anything you could call a "germ" or a "bug" - then naturally all infectious diseases would vanish.
No Ebola! No common colds! No yeast infections! Yay!
This may seem like the best thing ever to happen to humans, but as you'll eventually see, the loss of microbes would have dire consequences for humans, animals, plants, and the environment - stuff that makes a stomach bug or the flu pale in comparison.
Most nutrients would stop being made or cycled
Life depends upon the constant cycling and recycling of the basic elements of life.
A plant, for example, survives via photosynthesis on water (hydrogen and oxygen), sunlight (to convert water and carbon dioxide into sugar), and a host of other elements like nitrogen, phosphorous, and potassium. All of these basic chemicals are taken in from the environment and recycled back to the Earth after they're consumed.
And guess who controls and speeds along all of these processes? Microbes. Bacteria, for example, convert nitrogen and carbon dioxide from the air into usable components that plants and animals can use as essential building blocks.
A loss of all microbes would be terrible news for living organisms that can't create or take in these essential nutrients on their own.
Waste would accumulate indefinitely
If there aren't any microbes to break down complex compounds into their usable components, all of this "stuff" is going to build up.
Human and animal waste, for instance, is normally gobbled up by hungry bacteria and cycled back into the environment.
With nothing to break those materials down, as well as microscopic forms of waste, the buildup would mess with ecosystems and biochemistry worldwide.
All plants would die
As we've learned, plants are reliant upon bacteria to survive.
If they don't have microbes to take in and convert important chemical compounds into usable parts, they'll rapidly lose to ability to produce fuel via photosynthesis and will quickly die.
All ruminant animals — like cows, sheep, and goats — would starve
Ruminant animals can't digest cellulose, the main compound that makes up plant cell walls, on their own. They rely on gut microbes that can break down cellulose, allowing the animal to digest and absorb the nutrients from the plant.
A loss of microbes would mean that they'd starve.
And this assumes that there are plants to eat in the first place. Again, a loss of microbes entirely would mean that there would be no plants for them to eat at all.
Humans and other life would survive in the short term, but eventually would die
Humans are smart. We're innovative and we come up with solutions in the face of dire circumstances.
If plants completely lose their ability to take in nitrogen in a usable form, for example, then we can "fix" it for them by fertilizing plants by hand. However, this would ultimately lead to rapid global warming from increased animal respiration and use of fossil fuels, the study points out, eventually choking our oceans and soils of any sustainable life.
In the end, we'd survive for a period of time without microbes, but not indefinitely.
"[H]umans and other animals (e.g., insects) would survive for a time, decades or centuries even," the study authors write in the paper, "but long-term survival of most eukaryotes would be doubtful."
Hope it helps you..