-Second, living organisms are made up of similar substances: inorganic (water and minerals) and organic (carbohydrates, lipids, proteins, and nucleic acids). The biomolecules carry out many functions in the organism: to store energy, to form structures, to be part of chemical reactions, and to store the genetic information.
-And third, living things are composed of cells, one or more than one; and there are two types, prokaryotic and eukaryotic.
Levels of organization of living organisms:
subatomic particles - atoms - molecules - biomolecules - organelles - cell - colonies - tissues -organs - systems - organism.
Types of cells: Prokaryotic and eukaryotic
The Cells shape depends on the function the cell carries out in a living organism.
CO2 + H2O + Sunlight ---------------------- Glucose + O2
Heterotrophic nutrition: animals, fungi, protozoa and some bacteria need to obtain food from other living organisms.
1.Monera- Bacteria and Cyanobacteria (Prokaryotic)- Unicellular –Autotrophic or heterotrophic.- Asexual Reproduction
2.Protoctist – Protozoa and Algae -Unicelullar and multicellular- No tissues – Autotrophic and heterotrophic - Asexual Reproduction
3.Fungi: Yeasts, Moulds, Mushrooms – unicellular and multicellular –No tissues –heterotrophic - Asexual Reproduction
4.Plant. Mosses, Ferns, Flowering plants – multicellular – tissues – autotrophic - Asexual and sexual reproduction
5.Animals: vertebrate and invertebrates- multicellular –tissues - heterotrophic - Sexual reproduction
Autotrophic nutrition: plants and algae and some bacteria consume inorganic compounds such as water, carbon dioxide and mineral salts and using the sunlight, they produce their own organic compounds. This process is called Photosynthesis and is produced in the chloroplasts.