The radius of the circle would be 7.42in
Biosphere 2 was a tremendous success, Many people don't realize that hundreds of papers were written about it.
Probability of Green seed * Red flowers * Green pods
3/4 * 3/4 * 3/4 =27/64
You did not post the tree, but I would guess it would be Species 3 is most closely related to species 4.