Identify whether or not the following structures are convergent traits .

1) tailbone of human and tail of dogs
2) wlngs of bats and flippers of whales
3) true roots and root - like stems(rhizomes) of plants.
4) webbed feet of duck and otters.
5) long snout of egg- laying echidna and placental giant anteater.
6) flippers of dolphins and fins of fish
7) cactus spin and tree leaf