A trait such as the various shades of skin tone in humans, ranging from the darkest black to the fairest white skin tone is caused by:
1) a mutation in the DNA
2) a blending of traits
3) many genes working together
4) none of the above

What is one reason why transpiration is important in plants? question 19 options: it produces food from the sugar in the plant cells. it enables the flow of water out of the plant. it produces carbon dioxide in the leaves of the plant.