Scientists think that algae first evolved approximately 2.7 billion years ago, and soon after this oxygen began to exist in the atmosphere. Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere.
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Answer: Mi amigo lava los platos todos los dias, y limpia su cuarto los Martes y Jueves. Los Miercoles el poda el pasto y los Viernes el riega las plantas.
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My friend washes the dishes everyday, and he cleans his room every Tuesday and Thursday. Wednesdays he mows the lawn and Fridays he waters the plants
La población demanda políticas públicas que regulen las prácticas de reciclaje y apuntan contra las marcas como responsables de la gestión de los residuos.
