Concretions im pretty sure because they are in a <span>spherical shape</span>
A sudden change in a character/ gene / chromosomes of an organism is mutation.
Answer: congelar el agua.
Explanation: un fenómeno físico se produce cuando el cambio no es muy profundo y no altera la naturaleza química.
Yes, I believe it's <span>A. must be testable. So it can either be proven or disproved.
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The inhale and exhalation of animals as well as the photosynthesis in plants.
