In order for the horticulture department have its Vegetables garden it needs to increase its field's phosphorus levels. Although the nitrogen level doesn't need change. We would buy a bag of N-P-K fertilizer. Do we need a complete or incomplete fertilizer? .And why?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i