Answer:
4
Explanation:
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
Answer:
True.
Birth control pills contain a combination of hormones that prevent the formation of the ovule, by prevent the formation of the luteinizing follicle. There are several types of birth control pills,but the process is generally the same
Explanation:
Eubacteria que se utilizan en procesos industriales:
• Lactobacillus- se utiliza para la preparación de alimentos fermentados tales como queso y yogur.
• Levadura-se utiliza para la preparacion de pan y cervesa.
• Bacillus thuringiensis- se utilizan como insecticidas específicos para lepidópteros
• Escherichia coli-e utilizan en la biotecnología…
Answer:
Cell membranes are semi-permeable, which works like a sieve that determines what enters and leaves the cells.
Explanation:
It is semi-permeable and it allows molecules to diffuse inside.
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