Answer:
somites
Explanation:
Embryonic development looks like a chronometer. Next to the future spine, cells are differentiated with a certain spacing that scientists call "somites." These are structures that grow, change shape. Somites will give rise to vertebrae, ribs, and axial musculature.
Somites are transient epithelial structures. These structures form early in embryonic development and originate with other important structures in the vertebrate organism.
Soil creep is the downward movement of soil, on a slope, caused by the force of gravity. A slow deformation of soil material over a prolonged period of time, from pressure and stress. Creep occurs when the friction from materials resisting gravity move against each other. Slope is a key cause of soil creep.
Answer:
Sesmic? Maybe? I don't know your question.
The reactivity of an atom is due to the number and arrangement of Electrons (b) in the outer energy level.
Electrons "bond" they're the ones that react to create other elements.
Examples: Salt (NaCl) Carbon Dioxide (CO2)
And so on, and so forth. Thus, your answer....B.
