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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..