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 tadpole would die out. Which would cause the sudden decrease I duck and frog.
        
                    
             
        
        
        
Answer:
<u>C.  the types of cells and the tissues in which they can be found in a plant.</u>
 
        
                    
             
        
        
        
The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
        
             
        
        
        
Answer: 
1: B
2: C
3: D
4: D
5: B
6: C
7: A
Explanation:
Alleles: alternative forms of a gene
Gametes: sex cells that are the product of meiosis
Genes: unit of hereditary, made up of DNA
Traits: specific characteristic of an organism