Flagellum. This is the only thing I could come up with because you did not provide an image.
Answer:
Oxidized.
Explanation:
The complete sentence will be -
When a compound donates electrons, that compound becomes oxidized. Such a compound is often referred to as an electron donor.
The process of being a compound oxidized is termed as oxidation. In this process the oxidation state of the molecule, compound or atom is increased. It always occur in pair with the reduction and these two reactions are collectively termed as redox reactions. These redox reactions are the main source of energy in biological systems.
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Answer:
2%
Explanation:
The scientist believe that around 2% of the species that existed on Earth have been preserved in the fossil records. It is still a hot debate about it though, as there are only around 250,000 species identified in the fossil records so far, which is less than a quarter from the species that live in the present.
The reason why scientists believe that the majority of the species have not been preserved are very logical though. One of the reasons is that lot of species existed very long time ago, so their remains just didn't lasted so long. Other reason is the movement of the plates, where we have situation where plates that existed in the past have been totally suducted and melted in the mantle, while others are at the verge of it, so every fossil with them is melted and destroyed too. Another reason is that lot of species do not have hard parts, solid bone structure, so their preservation has been pretty much impossible,