Earth, an inhabited planet

Annotations:

• - Our planet receives enough light and heat from the Sun - A layer of gases protects the planet from harmful ultraviolet and infrared radiation. - Liquid water - Basis elements

Annotations:

• - Bioelements: C, H, O, N, S, P - Organic compounds: Biomolecules: sugar, fats, proteins, nucleic acids. - Inorganic compounds: Water and Mineral salts

Annotations:

• The cell is the basic structural, functional, and biological unit of all known living organisms. Cells are the smallest unit of life that can replicate independently,

1. Cellular Theory

   Annotations:

   • http://descartes.cnice.mec.es/edad/4esobiologia/4quincena5/4quincena5_contenidos_2a.htm
2. Structure

   Annotations:

   • http://descartes.cnice.mec.es/edad/4esobiologia/4quincena5/4quincena5_presenta_1a.htm
3. Organisation

1. Autotrophic
2. Heterotrophic

1. Sexual
2. Asexual