C.) Multi-cellular organism is that organism which has skeletal system!
Hope this helps!
Answer:
Aviation in World War I started with primitive aircraft, primitively used. Technological progress was swift, leading to ground attack, tactical bombing, and highly publicized, deadly dogfights among aircraft equipped with forward-firing, synchronized machine guns from July 1915 onwards.
Explanation:
I think it would be B. As the rest he did I think.
