Answer:
The lichen is a decomposer that digests rocks and forms soil.
organelles
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Skin pigments actually protect us from ultraviolet rays!
The hydrogen bond in polar molecules occurs only in compounds that have hydrogen bonded to N, O, or F.
These very highly electronegative elements create a partial positive charge on the hydrogen.
The H atom is attracted to the partial negative charge on an N, O, or F atom in another molecule.
The hydrogen bond is an attraction but not a true chemical bond such as ionic or covalent bonds. It is much weaker.
However, the hydrogen bond is a strong intermolecular bond.
Prions are misfolded versions of normal proteins that can cause diseases. So the correct option is D.
<h3>What leads to prion disease? </h3>
A misfolded confirmation of proteins is called Prions. These misfolded proteins can result in harmful functional proteins and cause several diseases.
A prion is the type of protein that usually cause the normal proteins in the brain to fold in an abnormal manner. This results in misfolding of proteins in the brain.
Prion diseases are known to affect both humans and animals. Sometimes, humans get prion diseases by consumption of by meat from infected animals.
Creutzfeldt-Jakob disease is the most common prion disease in humans. The occurrence of prion diseases is rare. In the US, about 300 cases are reported every year.
Therefore the correct option is D.
Read more about prion diseases, here
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