Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanicaland chemical. Mechanical weathering is the disintegration of rock into smaller and smaller fragments. 
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The 7 (sometimes 8) characteristics of life are:
1. living things are composed of cells
2. living things have different levels of organization
3. living things metabolize (i.e. use energy)
4. living things respond to their environment
5. living things grow
6. living things reproduce
7. living things adapt to their environment
(some sources include) 8. living things have genetic material
Viruses do not metabolize, they do not grow, they do not adapt to their environment, and they cannot reproduce independently; viruses require host cells to reproduce and perform the other functions that give them the appearance of aliveness.
        
                    
             
        
        
        
The fly species Drosophila santomea is found only on a single small island. Thus, this fly is considered to be "Endemic".
        
             
        
        
        
<h2>Nuclear Envelope</h2>
Explanation:
- <em>The endomembrane system</em> includes the nuclear envelope, the <em>endoplasmic reticulum, Golgi mechanical assembly, lysosomes, vesicles, just as the plasma layer</em>
- These cell parts cooperate to <em>alter, bundle, tag, and transport layer lipids and proteins </em>
- The nuclear envelope is a double membrane, implying that there are <em>two lipid bilayers</em>
- The nuclear lamina, a netlike cluster of <em>protein filaments, associates the layers of the nuclear envelope</em>