Answer:
The word serene describes the look of a person who is calm and unworried. She had a serene look on her face. His face was serene in sleep.
Explanation:
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~Zero~
(in mythology and fairy tales) a mischievous imp or sprite.
The cliffhanger is the lizard badge
Stem cells are a class of undifferentiated cells that are able to differentiate into specialized cell types. Commonly, stem cells come from two main sources:
Embryos formed during the blastocyst phase of embryological development (embryonic stem cells) and
Adult tissue (adult stem cells).
Both types are generally characterized by their potency, or potential to differentiate into different cell types (such as skin, muscle, bone, etc.)
