Answer:
They reflect the movements of the sun.
Explanation:
If you are talking about Stonehenge, it is believed that the stones are arranged according to the movement of the sun in the winter and summer solisticios. It is also believed that the arrangement of the stones is related to religious rituals, which celebrated union between humanity, religious dominance and the knowledge of the stars.
I believe the stem cells that are capable of the most limited differentiation are embryonic stem cells. Embryonic stem cells are pluripotent (meaning they are capable to grow and differentiate) stem cells derived from the inner cell mass of a blastocyst, an early-stage pre-implantation embryo. These stem cells are capable of growing into all derivatives of the three primary germ layers: ectoderm, endoderm and mesoderm.
Answer:
In autoimmune diseases, such as lupus, multiple sclerosis and rheumatoid arthritis, people produce antibodies that stick to their body's own proteins and attack healthy cells.
Explanation:
Yes they did. It is generally known that amphibians breathe through their skin.
