bio final - used as great food source. Ecological...

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Evolutionary success can be described by survival of the fittest. The seed, placenta, and diploidy, all have contributed to the evolutionary success of organisms. The placenta is involved with the mobility in the stomach of organisms. It transports food and other waste products. It creates immunity like antibodies throughout the placenta. It also increases the chance of survival for newborn babies. Diploidy cells have two homologous copies of each chromosome , usually one from the mother and one from the father . The variation is transferred through fertilization and meiosis or crossing over. Variation is mostly used for adaptation. Diploidy is a back- up set of chromosomes for gene replacement or repair. Seeds are created through double fertilization in angiosperms and it involves the fusion of the egg and sperm nuclei into a zygote. The seed is then formed inside of fruits. The seeds contain a covering called the seed coat which protects the embryonic plant from drying and infection. Seeds adapt through colonization of new lands. Seeds can be
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Unformatted text preview: used as great food source. Ecological succession is the gradual replacement of one community by another until a climax community is established. The characteristics of the species are transitioned. For example, a lake is replaced by a marsh, then meadow, and finally a forest. The energy flow between trophic levels starts from the autotrophs. They produce the energy that is needed by heterotrophs. An example is when grass gives energy to locusts then to mouse and then to snakes. Limiting factors are things that restrict population growth. Examples are population density and competition which are all biotic factors. Abiotic factors include moisture and temperature. All these factors are examples of a limiting factor. Carrying capacity is the amount of a population an environment is able to maintain. Predators are an example that helps sustain the population in each environment. Predators hunt their prey in order to limit the carrying capacity....
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This note was uploaded on 09/10/2009 for the course A 503 taught by Professor Henry during the Spring '09 term at University of California, Berkeley.

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