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.
This crust is inorganic and is composed of minerals. It covers the entire surface of the earth from the top of Mount Everest to the bottom of the Mariana Trench. The hydrosphere is composed of all of the water on or near the earth. This includes the oceans, rivers, lakes, and even the moisture in the air. Ninety-seven percent of the earth's water is in the oceans. The remaining three percent is fresh water; three-quarters of the fresh water is solid and exists in ice sheets. The biosphere is composed of all living organisms. Plants, animals, and one-celled organisms are all part of the biosphere.