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Food web with three food chains. Arrows point from one organism to the next in the chain. Chain 1: kelp, kelp crab, sea otter. Chain 2: kelp, sea urchin, sea otter. Chain 3: kelp, sea urchin, horn shark, elephant seal.
Which organisms are secondary consumers? Check all that apply.

A. Kelp
B. Kelp Crab
C. Sea Otter
D. Sea Urchin
E. Horn Shark
F. Elephant Seal

-efficient data acquisition

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-voice recognition systems

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.