<span>phosphate and sugars in their structures</span>
An onion cell has a rectangular shape
Billions of years ago, Earth's atmosphere lacked free oxygen.
Scientists call this a highly toxic atmosphere.
<h3>What kind of atmosphere was present on Earth in early times?</h3>
In the atmosphere of the primitive Earth there was no oxygen (O2) and nitrogen (N2), the air being composed of gases such as
- methane (CH4)
- ammonia (NH3)
- hydrogen (H2)
- and water vapors (H2O).
With this information, we can conclude that Early Earth's atmosphere may have been as toxic as that of Venus today. Earth is the only planet that harbors life (as far as we know)
Learn more about Early Earth's atmosphere in brainly.com/question/13154099
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<span>The human population is in an era of unprecedented growth. Developing countries typically have a birth rate well above replacement and some of the largest nations in the world have just recently become fully developed or are still developing: China and India. Their growth still outpaces the entirety of Europe which, on average, has a birthrate well below replacement. This low birthrate is typical of a first world country.</span>