jueves, 2 de febrero de 2012

animal and plant


SPIDER’S LIFE CYCLE AND REPRODUCTION


The stages in the life of a plant or animal make up what is called the life cycle. The word "cycle," just like in bicycle, refers to something that is in a circle. The stages in a life cycle repeat from one stage in life to the next, until they come around full circle.
Think of the life cycle of a human being. First the baby develops inside the mother's uterus. The next stage after birth is called infancy, followed by childhood, and then adolescence (the teenage years).
Adulthood is the stage at which physical growth of the body is complete. Adults can become mothers and fathers and have children. 









Life Cycle of Plant margarita & Plant Reproduction

The wide diversity of plants in nature is the result of changes that took place within their life cycle processes. The early water-based plants were limited in their ability to diversify and adapt because of limitations in their physical structures. As changes developed within plant life cycles, new methods for reproduction emerged and enabled land-adapted plants to appear.
Plant types
According to Ohio State University, plant varieties can be broken down into different subgroups based on physical structure and method of reproduction. Nonvascular and vascular plants differ in their structural makeup, with nonvascular types believed to be predecessors to vascular plants. The term "vascular" refers to a specialized plant tissue that conducts water throughout the plant body. Nonvascular plants lack this material, which is why they're primarily found in water-based environments. With the development of vascular tissue, plants were able to stand upright and take root in soil environments. This change enabled alternate reproductive methods to develop.






by :andres felipe erazo

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