Which of the following terms best describes the relationship between the values of two variables??

What are the major factors in the pathophysiology of RDS? 1. Qualitative surfactant deficiency 2. Increased alveolar surface area 3. Increased small airways compliance 4. Presence of the ductus arteriosus

a. 1 and 2 only b. 1 and 3 only c. 1, 3, and 4 only d. 1, 2, 3, and 4

Two of the objectives on a microscope are dry objectives, but the third objective is a(n) ________ objective that allows for greater magnification.  

Fill in the blank(s) with the appropriate word(s).