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.
An ecologists (a person who studies ecology) use the concept of an ecosystem is to help understand how organisms live in a particular environment.Ecosystem is a system formed by a group of living organisms and non-living surroundings.An ecosystem is a place where organisms and their physical surroundings form a balanced environment that is different from others nearby. Ecosystems consist of three main parts: -Physical surroundings, such as rocks, soil and water.-Living organisms. -living and non-living factors that make up the environment.cosystem is a system formed by a group of living organisms and non-living surroundings. An ecosystem is a place where organisms and their physical surroundings form a balanced environment that is different from others nearby. Ecosystems consist of three main parts: -Physical surroundings, such as rocks, soil and water.