How did thousands of visitors contaminate the paintings in the lascaux caves?
a. people generated humidity and heat, which produced a fungus.
b. people introduced light into the caves, which caused fading.
c. people removed sections of the cave drawings, leading to erosion.
d. people started fires in the caves, burning the canvas.

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. drag each phase of mitosis to the correct description.