Answer:
3.5 billion years ago, or in the Eoarchean Era.
Explanation:
The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.
The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago, during the Eoarchean Era.
Have a fantastic rest of your day!! \(^u^\)
Nitrogen is not a product of photosynthesis
<span>One reason this might be has to do
with the way your brain processes odors and memories. Smells get routed
through your olfactory bulb, which the smell-analyzing region in your
brain. It’s closely connected to your amygdala and hippocampus, brain
regions that handle memory and emotion. </span>
Answer:
According to the susceptibility towards antimicrobial agent the ranking from most susceptible to least susceptible is as:
enveloped virus > gram-positive bacteria > gram-negative bacteria > endospores > prions
Enveloped viruses are most susceptible because their envelope is made up of lipid which is easily disrupted or degraded by antimicrobial agents like detergent.
Gram-positive bacteria are only having one layer of cells wall that is made up of peptidoglycan which is susceptible to most antibiotics but gram-negative bacterial have an extra outer layer of covering made up of lipopolysaccharide so many of them show multidrug-resistance.
Endospore are among the most resistant microbial structure which is formed outer to cell wall and do not allow most antimicrobials to enter the cell.
Prions are infectious protein so antimicrobial agent do not work on prions and it also resist its chemical degradation therefore it is least susceptible.