To prevent the invasive species from entering texas freshwater ecosystem  the following steps should be taken they are described below.
Explanation:
The invasive species are dangerous to natural resources because they destroy the natural resources and ecological system. 
These invasive species are controlled by the biological control and mechanical control.
Thus to prevent the invasive species from entering texas freshwater ecosystem the following steps are taken they are
- Always clean and dry any equipment used in or around lakes or rivers after each use.
- Spray off your boat after you take it out of the water.
- Never dump aquarium or pet species into sewer system of waterways.
 
        
             
        
        
        
The probability of transmitting both traits to his son is Zero. This is because the son has one X chromosome and one Y chromosome (XX), therefore since the traits are linked to the X chromosomes, it means the son will only be a carrier but will not show the trait phenotypically. 
        
             
        
        
        
Answer:
They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth. Later, scientists used absolute dating to determine the actual number of years ago that events happened. The geologic time scale is divided into eons, eras, periods, and epochs.
Explanation:
 
        
             
        
        
        
The answer is A)<span> the desired gene is inserted into the genomes of the pork.
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The techniques of genetic engineering are used to introduce hybrid genes for some desired substance or protein or trait into other organisms. Here, the desired gene is inserted into pork's genome and as a result, it has a <span>higher flesh-to-bone ratio</span><span>.</span>
<span>- B) is not the right answer because it is not necessary to change all the genes in the pork genome or it will be transformed into totally different organism.</span>
<span>- C) is not the right answer because the pork does not have plasmids.</span>