Answer:
C) A changed to G in the first position of the codon.
Explanation:
In the translation of DNA,  triplets  or codons of mRNA  (a group of three nucleotides) are read according to a genetic code, to build proteins. 
Proteins are composed of amino acids. In the translation process, each codon codes for an particular amino acid according to the  genetic code as illustrated  in the DNA codon table (attached here).  
In this table we can see that if the first position  of any of the codons coding for Threonine ( ACT, ACC, ACA, ACG) is changed for G, Adenine is going to be encoded instead of threonine.
 
        
             
        
        
        
This would be an invasive species which is not native to the environment. It can cause harm either because it over grows (if it's a plant.) Or if it's an animal, it will reproduce and most likely take over the environment. This is because it feels the need to compete for materials, but ends either taking most or all of it. Which then ruins the food chain depending on it's diet. If it's eating a plant, then other animals that eat that plant no longer have any food. And vice versa if it's feeding on animals. Other predators, no longer have their food. 
 
        
                    
             
        
        
        
Answer:
a catalytic converter is device made up from metals like metals like palladium and rhodium to reduce the toxic gases emitted in the environment
Explanation:
Catalytic converter is an exhaust emission controlling device. It was made to reduce pollutants in air. Almost every automobile has a catalytic converter. It is present to completely remove the fuel that was not combusted and other toxic/dangerous compounds before they are let out in the environment.
If the catalytic converters are not used then the harmful compounds are released in the air and thus increasing air pollution and also decreasing the air quality for breathing in the surrounding environment.
 
        
                    
             
        
        
        
Clostridium, Bacteroides, and the methane-producing archaea (methanogens), are called obligate anaerobes because their energy-generating metabolic processes are not coupled with the consumption of oxygen.
        
             
        
        
        
In the deformed mice, somatic cells but not germ cells were mutated. The original mouse's germ cells were mutated.