Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanicaland chemical. Mechanical weathering is the disintegration of rock into smaller and smaller fragments.
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1. mother to fetus 2. through exposure to the antigen (virus, toxins, or cancer cells).
Humans get amino acids from protiens in the food we eat. As we digest the food, the enzymes in our stomach and small intestines break down proteins into small amino acids. So technically, we do not make amino acids, we get amino acids from eating food high in protiens.
Answer: Las células son las unidades de construcción más básicas de la vida. Todos los seres vivos están compuestos por células.
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