1. ¿Por qué los cuatro elementos (tierra, fuego, viento y aíre) fueron esenciales para la historia de la Tabla Periódica y de la Química? 2. ¿Qué aportes ha dado la Tabla Periódica a la Ciencia y la Tecnología? Escribe 2 ejemplos. 3. ¿Qué beneficios le ha traído a la familia el descubrimiento de la tabla periódica? 4. ¿Qué otro nombre recibe cada grupo de la tabla periódica?

Rue or false siblings look simila rbecause they each have some traits of their parents.

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight