Which trait evolved first, lungs or hair? explain how you know?

Lung evolved long before  hair

Lungs evolved along fish which preceded land mammalian animals that have hair in their body. According to the theory of evolution, Vertabraes evolved from fish,several million years ago. Fish have lungs but do not ahve hair, but all mammals have hair and lungs.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.