Answer:
Glue and sawdust.
Explanation:
Glue and sawdust are the substances that applied in wood to fill up cracks and grooves. You can use the glue and sawdust method to fill the gaps present in the wood. This method is a quick and easy solution that successfully fill up the gaps and grooves on the wood. The method of using this method is, first fill the gap with a small amount of wood glue, then rub sawdust into the gap which attached the saw dust with itself and the gaps are filled.
 
        
             
        
        
        
Plants, microorganisms, and animals
        
             
        
        
        
Hydrophobic is when it cannot dissolve in water and hydrophilic is when it can. an example is a phospholipid in the cell membrane- the the tails are hydrophobic and the heads are hydrophilic.
        
             
        
        
        
Answer: 
All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Explanation: