An eclipse occurs when celestial object moves into the shadow made by another celestial object. Option A
<h3>What is an eclipse?</h3>
The term eclipse refers to a situation in which in which one celestial body casts a shadow on another celestial body. In this case, we could have the earth cast its shadow on the earth or the sun as the case may be.
The kinds of eclipse that could occur are;
- Eclipse of the sun
- Eclipse of the moon
This brings us to conclude that; an eclipse occurs when celestial object moves into the shadow made by another celestial object. Option A
Learn more about eclipse:brainly.com/question/4279342
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Is it multiple choice? I believe it's brain, but I could be wrong. 
        
             
        
        
        
PH meter, which is a device used to measure hydrogen-ion activity in the solution. A PH meter is a voltmeter stuck to a pH electrode and a reference electrode. -maclittleseed
 
        
                    
             
        
        
        
If thousands of glucose molecules were bonded together with equal numbers of sucrose molecules, the resulting substance could be described as a polysaccharide. They are <span>polymeric carbohydrate molecules composed of long chains of monosaccharide units bound together by glycosidic linkages.</span>
        
             
        
        
        
The mechanism that affected the gene pool of the immigrants that entered the United states Through Ellis Island is Gene flow.
Gene flow involves the movement of genes or alleles between interbreeding populations of a particular species. In other words it is the movement of genes from one population to another population. Actually it may be an important aspect of evolution; evolution can occur as a result of genes being transferred from one population to another. Gene flow occurs when there is migration, since the loss or addition of people can easily change pool frequencies even without no other evolutionary mechanisms operating.