The second one
One gene for a particular trait
        
             
        
        
        
In order to increase the rate of diffusion of materials in and out of the cell, the following modification can be done to the cell:
1. the shape of the cell can be changed to one that has high surface area to volume ration, for example sphere.
2.The cell can also divide into two in order to increase the surface area to volume ratio. 
        
             
        
        
        
Answer:
The correct answer is carbohydrate chain.
Explanation:
Plasma membrane contain three types of protein  a peripheral protein b transmembrane protein and c GPI anchored protein.
     Some membrane protein basically peripheral proteins contain oligosaccharide chain arranged towards the extracellular region of the plasma  membrane with respect to the surface of that glycoprotein.
    The oligosaccharide chain of glycoprotein play an important role in to identify signals from outside the cell.These signals may include the entry of virus particles inside our body,protein targeting etc.
 
        
             
        
        
        
- <u>Adaptations </u><u>are unique characteristics that allow animals to survive in their environment.</u>
- <u> There are </u><u>three </u><u>types of adaptations: </u><u>structural</u><u>, </u><u>physiological</u><u>, and </u><u>behavioral</u><u>. Structural adaptations are how the animal's body functions or looks on the ou</u>tside.
What are 3 ways animals can adapt to their environment?
Animals adapt to their environment in a variety of ways; an animal's color, behavior, defense or diet, for example, may serve adaptive functions.
- Color and Pattern Adaptations. 
- Behavioral Adaptations. 
- Defensive Adaptations. 
- Dietary Adaptations.
What is an example of an animal adapting to its environment?
- Adaptation can protect animals from predators or from harsh weather. 
- Many birds can hide in the tall grass and weeds and insects can change their colour to blend into the surroundings.
-  This makes it difficult for predators to seek them out for food.
Learn more about Adaptation 
brainly.com/question/5082196
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When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.