Did you ever figure out the answer to this? I have the same question and don't know the answer. 
 
        
             
        
        
        
Answer:  By keeping plastic from being dumped in to the water, especially water in witch animals inhabit. also by using reusable cups instead of plastic bottles.
Explanation: Hope this helps!
 
        
             
        
        
        
To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies. Each DNA sequence that contains instructions to make a protein is known as a gene.The DNA housed in the nucleus is too large to move through the nuclear membrane, so it must be copied by the smaller, single-stranded RNA (transcription), which moves out of the nucleus to ribosomes located in the cytoplasm and rough endoplasmic reticulum to direct the assembly of protein (translation).
        
             
        
        
        
<span>The thyroid’s main role in the endocrine system is to regulate your metabolism, which is your body’s ability to break down food and convert it to energy. Food essentially fuels our bodies, and our bodies each “burn” that fuel at different rates. This is why you often hear about some people having “fast” metabolism and others having “slow” metabolism.</span>