Answer:
New experimental methods
Technological inventions
Explanation:
A scientific theory is usually not based on speculation. Scientific theories must have a solid empirical basis.
However, experimental methods are limited to the caliber of equipments available at the time in which a theory is formulated. With advancing years, more technological sophistication leads to the invention of new instruments and ultimately, the development of new experimental methods.
These innovations are likely to alter existing scientific theories as new evidences emerge, hence the answer.
<span>Estradiol is a type of steroid produced by the ovaries and it is strong that could cause gynecological problems and cancer.</span>
<span>Yes it is true, Because we are breath in air in the form of smoke and very small practical plagued our lungs, Which are very danger
for our body. Computerized tomography imaging studies on the bodies of ancient mummies have detected evidence of pneumonia, emphysema and many types of asthma problem occur in our body .</span>
Answer:
D H2PO4– + HPO42–
Explanation:
The acid dissociation constant for 
are 
respectively.
The reason while option D is the best answer is that, the value of pKa for both
lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.
Using Henderson-Hasselbach equation:
