The best answer is A and D
<span>This includes about 3,000 species in North America. Biologists and naturalists believe that there are many more species of spiders still to be identified and named. The 35,000 species of spiders in the Order Araneae are grouped into three sub-orders and seventy different families.</span>
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Fossils are formed in different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock.
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The cell membrane is selectively permeable, allowing only certain substances to pass through. Passive transport is a way that small molecules or ions move across the cell membrane without input of energy by the cell. The three main kinds of passive transport are diffusion, osmosis, and facilitated diffusion.