The iliac crest is easily palpated from the bodyâs exterior, making it an easily identifiable landmark. The iliac crest also lends itself to bone grafting and bone marrow transplants thanks to its proximity to the bodyâs surface and the large amount of bone tissue and red bone marrow found in the ilium.
Ecosystems have an atmosphere, soil, light, heat, water and living  organisms. The living organisms in an ecosystem can include plants,  animals or both.it is formed by livi â¦ ng non living thing.ll ecosystems must have a producer. A producer is a plant that can make its own energy (autotrophic). Th â¦ en, primary consumers eat the producer, taking 10% of the energy produced in the previous organism for itself. This is a small ecosystem, but an ecosystem nonetheless.
Estuarine ecosystems. 1  These are areas where both ocean and land contribute to a unique ecosystem. 2  A basic feature is the instability of an estuary due to the ebb and flood of the tide. 3  Plant and animal wastes are washed away, sediment is shifted and fresh and salt water are mixed.