body covering like fur , feature and scale can help us to decide to which group an animal belong
Lunar phases occur because one-half of the moon is always lit up by the sun. ... At that point, Earthlings would be basking in the light of the full moon. To a person standing on the moon, this full moon's reflected light (and maybe some artificial light) might make the new Earth faintly visible.
The quadriceps femoris is composed of three "vastus" muscles and the rectus femoris
A muscle with the ancestor from the shaft of the femur, with insertion into the tibial tuberosity, with nerve supply from the femoral nerve, and whose action extend the leg.
The largest and main artery of the circulatory system is the aorta.