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sharks, whales, and dolphins share similar features such as body shape and the position of fins. however, sharks have gills for breathing, while
whales and dolphins have lungs. these differences indicate that the organisms share a common ancestor for
whales also possess a vestigial pelvic bone. the presence of the pelvis bone may indicate that whales

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substitution is the answer in this case

ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.