Homo sapiens and Homo erectus
Reptiles
Salamanders are related to newts.
A cod is much more closely related to a shark than to a human.
Animals
A cat is the species most closely related to humans. Cats and human are both endothermic mammals. Although most whales are also mammals, cats and humans have the most traits in common.
Family and kingdom
Convergent Evolution is the reason. :)
legs
Whales are related to the even-toed hoofed mammals. Whales are most closely related to modern hippos, and should share a common ancestor with them.
The lateral lines are most closely related to the human ear. They detect vibrations not sound.
No. Although chimps are closely related they are not human.
The simplistic answer would be 'Related to all living things'. Monkeys are fairly closely related to human beings.