<span>Aboriginal cultures believed the world was created by ancestral totem spirits during dreamtime. Dreamtime is the way the Aboriginal peoples understood the world and how it was created. It was thought to be the beginning of knowledge and where laws came from. They believed that for their survival, they must observe those laws.</span>
Aboriginals believed that spirits gifted them everything in life. They believe that their creators continue to live on in the stars. Aboriginal art can be dated back in Australia about 65,000 years ago.
Organ systems. Organs are grouped into organ systems, in which they work together to carry out a particular function for the organism. For example, the heart and the blood vessels make up the cardiovascular system
