Answer:
a.  pipette 
Explanation:
The instrument used in the laboratory for measuring base is the pipette. 
It is used to suck up the right amount of base for experimental purpose. 
- The burette is used for measuring and holding the acid. 
- The pipette is often used alongside a burette, conical flask and retort stand during a titration reaction. 
- The pipette is a narrow cylindrical pipe usually made up of some special glass. 
- It should be handled with caution as it is a very fragile device. 
 
        
             
        
        
        
The crystals that form in slowly cooling magma are 'large rocks'. 
I think that is the answer, not 100% sure!
        
             
        
        
        
light absorbing molecules that plants absorb from the sun is PHOTONS and the act or process of is photosynthesis.
 
        
                    
             
        
        
        
A mutation is a permanent change in the DNA sequence of a gene. This can be beneficial if the change gives a new function to or improves the function of that gene. 
<span>The above is a definition. But one must really define "beneficial". Some regard it as beneficial if it helps the specific individual who has it. Others would think it beneficial if it produced some survival advantage that insured more descendents for that individual. </span>
<span>It is the difference between a mutation that allowed for greater athletic ability, but a decreased desire for offspring, versus a more moderate athletic enhancement, but a greater desire for offspring. </span>
<span>The small percentage of ways to improve an organism, versus the near infinite ways of harming the organism, mean that most mutations are not going to be beneficial. At best, they will be "inconsequential" - such as a new shade of eye color, or a mole on a section of your skin. </span>
The populist notion of "powers" that can come from mutations is wildly inaccurate. Even assuming a minor power like the ability to see infra red radiation would take thousands upon thousands of mutations over vast amounts of time. A mutation for blindness is far more likely.
<span>It should also be noted that the traditional model of evolutionary theory no longer applies to man. We don't allow changes in our environment, and without such changes, there is no need for one trait more than another to predominate. After all, it is irrelevent that a mutation might allow for greater speed in running, when everyone drives a car.</span>
        
             
        
        
        
The correct answer is - a front.
On this image, the lines are representing a front, and since the signs are marked with blue color, it means that it is a cold front. The fronts are advancing masses of air. In this case, we have a cold front, thus we have advancing cold air masses in the western part of the US, and in the Great Lakes region and the northeastern part of the country. This means that these areas will be affected by colder air masses, that will bring in higher air pressure, colder weather, and cold winds from the direction from which these cold fronts are coming.