Most animals, including humans, have bilateral symmetry, which means our bodies are pretty symmetrical. At least on the ...

This internal left-right asymmetry is believed to begin at the very early stage of development -- when a tiny embryo is divided into two parts during a process called gastrulation. This process ...

Most animals, including humans, have bilateral symmetry, which means our bodies are pretty symmetrical. At least on the outside.On the inside, things ...