Look at these rock layers. Which of the following must be correct? This is an igneous rock. It formed from minerals

This is a metamorphic rock, it formed when molten rock cooled.

This is a sedimentary rock, the oldest rock layer is at the top, the youngest rock layer is at the bottom

This is a sedimentary rock, the youngest rock layer is at the top, the oldest rock layer is at the bottom.

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.

What role do traits play in affecting an organisms ability to reproduce? finches

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited