what role does differential reproduction play in natural selection?

a) some organisms have different reproductive success due to nongenetic traits.
b) some organisms have traits that them reach reproductive age.
c) different methods of reproduction result in some organisms being genetically altered.
d) reproduction varies among organisms due to pathogenic factors.

the answer is not a or d based on other posts. (or maybe the other posts were wrong? ) does anyone know?

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?