Answer:
C 
Explanation:
because it is. because it is. 1 +2 = 3 right and c is the 3rd letter in the alphabet so it is c 
 
        
             
        
        
        
Answer:
B.Lipid
Because With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains. Glycerol 
 
        
             
        
        
        
We basicly can't digest them as it has cellulose and we can't digest cellulose .acc. to me in olden days early men used to survive with raw green plants because the cellulose is digested by our appendix  but slowly as  we stopped eating raw green plants the appendix lost it function tooo. so  we should always eat a  selective plant like lettuce 
        
                    
             
        
        
        
Answer:
Muscle contraction is an example of mechanical contraction.
Explanation:
Muscular contraction is the activation of generating tension which appear in the muscle fiber as it does't change the length of muscle and is followed by muscular relaxation.
Muscle contraction is based on force and length.
The process of skeletal muscle contraction is an energy requiring process.
In order to perform mechanical work,actin and myosin  utilizes the chemical energy into ATP that ultimately require during muscle contraction and relaxation.
In a working muscle,glucose is released  from glycogen that are stored in the muscle by the process of glycolysis in which glucose broken down into ATP that is required by cells and tissues.
 
        
             
        
        
        
Answer:
I believe a layer deep underground would have older things, because the ground could erode over time causing the fossil to sink into the ground.