Answer:
cell membrane
Explanation
It's the outer living boundary of animal cells. It's made of lipid and protein. Plasma Membrane is a mosaic of phospholipids, cholesterol, and proteins, the proteins in plasma membrane regulates the coming/going of substances into/out of the cell.
 
        
             
        
        
        
Answer:
The heart valves
Explanation:
The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.
 
        
             
        
        
        
Answer:
5 · every skin cell in a human body
 
        
             
        
        
        
One evolutionary explanation for why lizards living in the same part of the habitat would have similar characteristics is adaptation. It is a function or structure that is very common in lizards and other animals. If the lizards are leaving in a same part of habitat they will have the same characteristics which they will adapt coming from the same habitat.
        
             
        
        
        
Answer:
The structure of proteins is complex and unique, and only specific molecules can interact with their surface features. The natural shape of each protein is termed the native state. When proteins are exposed to heat, acid, or alcohol, their shape is disrupted and they become nonfunctional or denatured.
Explanation:
Physical agents such as heat, and chemicals such as alcohol and acids cause protein denaturation, that is, a loss of the spatial conformation and structure of the proteins and with this their functionality. Depending on the intensity of the event there may be total loss of function. The three-dimensional structure of a protein is basic for the protein to perform its function correctly.