Dylan is on a strict vegan diet he does not consume meat, fish, eggs or dairy products. which nutrient is difficult to obtain naturally from a vegan diet. 1.vitamin a 2.vitamin b3 3.vitamin b12 4.vitamin c 5.vitamin e

3.Vitamin B12

Explanation:

Vitamin B12 is also called cyanocobalamin. It is the only B vitamin that is not present in any of the vegetables. The most common sources of vitamin B12 are liver, eggs, cheese, meat, kidneys, and milk.  

A vegan diet is the one that does not include any food product from animal sources. It also does not include any dairy products. Since vitamin B12 is found only in food products of animal origin and in dairy products, Dylan would not be able to obtain vitamin B12 from the vegan diet.  

the dark variety, as they are not visible on the dark tree barks

explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.