Name two liquids which help in the transport of substances in the human body.

_____is the hardest substance in the human body.

Hardest substance in human body is

Hardest substance in human body is

Name a protein which is involved in the transport of oxygen inside the human body.

This helps in the transportation of oxygen in human beings

Umbilical cord helps in the transport of substances to and from the embryo. Which among these is not a function of the umbilical cord:

Name the hardest substance present in the body.

Name some animals who help in transportation?

Name the hardest substance in the body.