a chemical landfill is where chemical waste is stored once it has been used 
if it is secure it means that the waste cannot pollute the environment through water, air etc
 
        
             
        
        
        
They all have diverse plant life with the occasion of animals sometimes
        
             
        
        
        
There are three ways in which exogenous dna can be
introduced into a bacterial genome. These are; transduction, transformation and
conjugation. Transduction is the introduction of exogenous material into bacteria
by viruses; conjugation is exchange of genetic material between bacteria sexual
through  reproduction; while transformation
is uptake of exogenous dna by bacteria, from its surrounding, through the
bacterial membrane.  
 
        
             
        
        
        
The choices can be found elsewhere and as follows:
1.are soluble and can easily pass through cell membranes 
<span>2.contain long chains of amino acids and fatty acids </span>
<span>3.contain atoms of carbon, hydrogen, oxygen and nitrogen </span>
<span>4.are a direct result of dehydration synthesis
</span>
I believe the correct answer is option 1. When most proteins, fats, and carbohydrates are digested completely, they are converted to end products that are soluble and can easily pass through cell membranes. So as to distribute the nutrients needed in different parts of the body.