Refers to the rule that populations of birds and mammals living in warm, humid climates have more melanin (and therefore darker skin, fur, and feathers) than populations of the same species living in cooler, drier areas.

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).

If your blood becomes too concentrated with iona, what will happen to the red blood cells

What are the student's observations and inferences before he starts his investigation?