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.
Ecosystems are made up of organisms and the abiotic factors present. Major ecosystems are called biome. Biome type is based on vegetation and organisms' adaptations to the en â¦ vironment.There are both land biomes and aquatic biomes. Deserts are one type of biome.The definition of a biome is a naturally occurring large community  of fauna and flora that occupies a forest or tundra or other  habitat.nswer   Biomes are the major communities of the world. they are characterized by distinct vegetation and animals. Climate, temperature and rainfall determine to a large â¦ extent the biomes of the world.