The first was that all organisms have descended with modification from common ancestors.
The second was that the major agent of modification is natural selection acting on variation between individuals.
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.
Air<span> first </span>enters<span> your body </span>through<span> your </span>nose<span> or </span>mouth, which wets and warms the air<span>. </span><span>The </span>air<span> then </span>travels through<span> your voice box and down your windpipe. The windpipe splits into two bronchial tubes that </span>enter <span>your lungs.
(hope that helped )
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Earthworms maintain homeostasis by having a dual circulatory system, which contains the closed circulatory system and the coelomic fluid for respiratory gases, food and waste.
Uranus cant support life due to having no oxygen supply, and the temperature drop is uninhabitable. You wouldn't be able to make your planet suitable.