Phloem is a food source for some animals. How can you justify this statement?

Explanation

1) Certain mammals scratch the bark of trees to get at the food stored in the phloem, especially during hard winters when food is scarce.
2) Voles do this to young saplings at ground level and rabbits can do much damage to older ones.
3) Aphids absorb so much sugar from the phloem that they cannot assinilate all of it and it passes out of the anus as a sticky syrup called honey - dew.