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2- Getting and using energy: a- Nutrition plants: Green plants make own food. Through the processes of photosynthesis * Photosynthesis: plants use energy from the sun and change carbon dioxide CO2 and water H2O into sugar C6H12O6. Energy from the sun is therefore stored in sugar. *Photosynthesis produces oxygen O2. *Chlorophyll green pigment in leaves contains chloroplast needed for photosynthesis. b-Nutrition Animals: get energy “nutrition” by eating other plants or animals. The original source of energy is the sun. “Water” is also an important part of nutrition in plants and animals. c- Respiration: is the processes that organisms use to release “burn” energy stored in food. Respiration is the opposite of Photosynthesis. Photosynthesis: energy + carbon dioxide + water = sugar + oxygen Respiration: sugar + oxygen = energy + carbon dioxide + water All organisms get energy directly or indirectly from the SUN 3- Getting ride of wastes : “Excretion” process of removing waste from the body. Filtered out of blood. a-Wastes = Carbon dioxide, urea, salt & excess water. b-Wastes are removed by exhaling, perspiring, and urinating in animals, and transpiration in plants. by 4-Responding to changes in the environment: regulation Organisms and external changes known as Stimuli. respond to internal in their environment a- Examples = migration, drinking, perspiring, hibernation, growing of fur etc.. b- Regulation helps organisms maintain “homeostasis” the maintenance of a constant internal environment. 5-Reproduction: Organisms reproduce to ensure the survival of species. a- Two Types of reproduction: 1) Asexual Reproduction: process of producing a new organism with only one parent. The new organism has the exact same DNA as the parent. b- Types of Asexual Reproduction: Fission or Binary Fission: one cell splits to form two cells with the same DNA Budding: a new organism grow from the body of the parent. The bud can stay on to form a colony, or break apart Regeneration: A new organism forms from a piece of the parent or the parent re-grows the missing piece Sporulation: Some organisms produce reproductive cells in a protective covering called a Spore. 2) Sexual Reproduction involves the combination of DNA from two parents. Fertilization is the joining of DNA from The male (SPERM, POLLEN) and DNA of the female (EGG). The new organisms is a combination of both parents.