Lol, check your science book  incase im wrong but 
a·mi·no ac·id<span>əˌmēnō ˈasəd/</span>nounBIOCHEMISTRYplural noun: amino acidsa simple organic compound containing both a carboxyl (—COOH) and an amino (—NH2) group.
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Answer: c. The Earth’s surface is responsible for a small fraction of heat radiation to space.
Explanation:
In later ages the large amount of sun's energy is reflected back by the terrestrial surface back to the space. But now due to the abundance of large concentration of greenhouse gases in the atmosphere is responsible for the absorption of thermal energy from sunlight by these gases causing the atmosphere to be hot. This is the reason of global warming. Now only small fraction of heat is radiated back to the space.        
 
        
             
        
        
        
Hello! 
RNA in cells differs from DNA in that it is single-stranded and can fold up into a variety of structures.
RNA is the abbreviation for RiboNucleic Acid. It is a biological molecule that fulfills an important role by copying the information stored in the DNA (DeoxyriboNucleic Acid) and transporting it to the different proteins by folding into different shapes. Its name come from a Ribose molecule that is present in this single-stranded molecule.  
Viruses don't have DNA, only RNA. They only replicate in the host's cells by copying their own RNA information. 
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The answer is:
Community Diversity.
Reason Why: Here is an example, say you have 2 communities, community 1 is A, and community 2 is B, Communities A and B contain 5 tree species, However because community B has greater species evenness it has greater species diversity. 
Community A is dominated by one of its 5 species and so has lower species diversity than.....community B, which has the same 5 species but in equal proportion. 
Richness- Number of Species
Evenness-Relative abundance. 
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I think the answer is -
when the body experiences a drop in temperature it forces the water molecules to move faster in order to break the hydrogen bonds and release energy as heat.
hope this helps you.