The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
If the chromosome is an X shape the two rods that make it up are chromatids and the center that holds them together is the centromere
Answer:
2nd level has 4 orbitals. An f sublevel has 7 orbitals.
