the test has errors and ambiguities, as all tests do. Mammals cannot respire anaerobically, respiration is oxidative phosphorylation which can only occur with the oxidizer oxygen in mammals. Igneous rock, which is solidified magma, can be deeper that metamorphous rock in certain cases

canids hump to assert dominance, not for sex. Hence girldogs do it too

I've not seen any of these images in their intended format, ie commercials but they are beautiful