How to get dermal toxicity from reliable supplier?

What is one affect on the australian environment due to the introduction of non-native european rabbits

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

Which in counting the age of a tree? a.rings seen in the stemb. height of the treec. width of the tree