Answer:
Bad mutation: deletion/addition mutation 
Good mutation: silent mutation
Explanation:
Addition or deletion mutation results in the reading frame of codons to be changed, leading to a extensive missense mutation that will lead to a non-functional protein product to form.
Good mutation are silent mutations that leads to no change to the final product but causes codons to change in sequence. This increases genetic diversity in the gene pool that enables the species to be more resilient to environmental changes. 
 
        
             
        
        
        
Answer:
they act as barrier between inside and outside of body and protect the body from various viruses
Explanation:
 
        
             
        
        
        
Answer:
The bipedality
Explanation:
<u>One of the things the discovered fossil signified was that human bipedality was more ancient than the large brain size</u> because Lucy actually had a small skull which could indirectly be translated to small brain size. 
NOTE: Bipedality can be described to mean the ability of an organism to move about with two legs. Hence, it must have been discovered that Lucy had two legs.