The answer would be D. Huntington's disease presents symptoms in humans after many have already reproduced; therefore, they are unaware that they passed on Huntington's disease.
 
        
             
        
        
        
Answer:
 A relationship between unrelated organisms in which oneorganism get benefit and the other is not affected is known as commensalism.
Explanation:
 In commensalism organism live in a symbiotic association. the best example is the growth of epiphytes on the top or surface of orchid plants. The epiphytes obtain nutrients from orhids while in return orchids have no benefit from epiphytic plants.
        
             
        
        
        
A massive landslide Mud flows in the Toutle river.
<h3>How changes have occurred in the North Fork Toutle River?</h3>
There had been many earthquakes in the area prior to eruption but this happen to be a massive land slide because a moving magma have over steepened the mountain slopes. 
This geologic process uses gravity to cause rock, soil, artificial fill or a combination of the three to move down a slope. Slow weathering of rocks as well as soil eruption and volcanic activity also causes landslides
Thus, massive landslide Mud flows in the Toutle river.
To learn more about North Fork Toutle River click here:
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