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Long-day plants are plants that flower when the length of the day is longer than about 12 hours. Many long-day plants flower in the late spring or summer. Some of the most popular long-day plants are spinach and dill. The clover pictured below is also a long-day plant and shows the clover before and after blooming.

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Keystone species are species that the ecosystem depends on to function well. In most ecosystems on the east coast, the bee is a major keystone species. This is because the bee is the most common and most active pollinator.

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A gymnosperm cone is the gametophyte of a plant. In these pine cones, there are two types of gymnosperm cones. One, the smaller male cone, is found higher in the tree and produces pollen. While the larger, female cone is found lower on the tree to catch the pollen and fertilize the seed inside.

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In conifers like this spruce, the seeds of the tree are out in the open. Other trees, called angiosperms, have flowers or fruits to protect the seeds before reproducing. The green spruce tree below shows the gymnosperm leaf of the tree and cone, which is a modified leaf, for reproduction.

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A gametophyte is the generation of the plants life where the plant generates gametes, or haploid reproductive cells. All plants and some algae go into the gametophyte phase. Mosses, as pictured below, spend the dominant time of their life in the gametophyte phase.

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An introduced species, also known as an invasive species, is a species of plant or animal that is not native to and destroys the new environment it is in. The stinkbug is an excellent example of an introduced species in America. They are native to China, Japan, and other asian countries, but were brought to America in the 1990's. The stinkbugs have since been invading homes.

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The ovary of the flower is the female reproductive organ in a flowering plant. It is located at or below the base of the petals but above the stem. In the picture below, you can see the inside of the flower at the ovary and the growing ovule.

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An exoskeleton is a hard exterior that holds the structure of the organism together. In contrast to many larger animals, which have an internal bone structure, animals such as spiders, ants, crabs, and the ladybug(pictured below) have exoskeletons.

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A eukaryote is any organism with one or more cells that contain a nucleus, as well as other organelles, enclosed in a membrane. There are many examples of in plants and animals, in fact, most organisms, both unicellular and multicellular, are eukaryotes. This tree is one example of a eukaryote.

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A detritivore is an organism that feeds completely on dead organic material to obtain nutrients. Common examples of detritivores are earthworms, millipedes, and the pill bug or "roly poly" as pictured below.