This is true they are the products of photosynthesis and the reactants for aerobic respiration.
Answer:
The earliest known life-forms on Earth are putative fossilized microorganisms, found in hydrothermal vent precipitates, that may have lived as early as 4.28 billion years ago, relatively soon after the oceans formed 4.41 billion years ago, and not long after the formation of the Earth 4.54 billion years ago.
Explanation:
In moving from the outside environment to the inside of a bacterium, the first layer encountered would be Glycocalyx.
The cell coat or outermost layer of bacterial cells is called the glycocalyx. Glycoproteins, glycolipids, and proteoglycans make up its composition.
It is a network of lipids and membrane proteins connected by polysaccharide chains. On the lumen side, it encircles the vascular endothelial cells.
Various bacteria have varied glycocalyx layers with different compositions and densities. It serves as a protective layer and participates in cell interaction, signalling, and identification.
To learn more about Glycocalyx click here
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