You are presented with the question "the surface of a beach is formed by what force?" and the following answer choices:  - heat  - Gravity  - Rocks  - water  - wind  - Pacific  - kinetic  - a wave  Now knowing that the surface of a beach is formed by mechanical weathering and water is a mechanical weathering force, choose the best answer.
water
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You are presented with the question "What do vertebrate chordates have?" and the following answer choices:  - aerobic capacity  - primitive structures  - a spinal cord and nerves  - invertebrate structures  - Veins and arteries.  - cell walls  - characteristics  - principals of aerodynamics  Now knowing that vertebrate chordates have a backbone and strength correlates with our spinal cord and our nerves, our backbone, choose the best answer.
a spinal cord and nerves
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You are presented with the question "what is freshwater habitats that contain little or no salt?" and the following answer choices:  - Animal survival  - allow growth  - weathering  - atmosphere  - loose soil  - ecosystems  - salt and water.  - oceans  Now knowing that freshwater biomes have water that contains little or no salt and biomes are global ecosystems, choose the best answer.
ecosystems
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You are presented with the question "What found in a place shows that animal or plant used to live in that place?" and the following answer choices:  - remains  - Echinoids  - dirt  - Earthworms  - unique  - an image  - rocks  - water  Now knowing that if fossils of an animal or plant are found in a place then that animal or plant used to live in that place and fossils are the remains of prehistoric life, choose the best answer.
