An Earth scientist is testing how various soil mixtures affect plant growth. She begins with 10 soil types. For each mixture, she combines equel amounts of 2 soil types. How many soil mixtures must the scientist create in order to test all possible combinations of the 10 sol types?

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

sorry, is there a picture? i do not see any arrows.

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which fault and or fold did you find most difficult to diagram