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The 3 Types of Natural Selection

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Natural selection is defined as a process or a “force” that allows for organisms better adapted to their environment to better survive and produce more offspring. The theory of natural selection was first founded by Charles Darwin. The process of natural selection is important and is a driving force for evolution. For organisms to evolve,…

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The Circulatory System

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There are multiple organ systems in the human body that work together to keep us alive. One of these systems is the circulatory system. The major components of the circulatory system are blood, blood vessels, and the heart. The main function of the circulatory system is to transport nutrients and gases throughout the body so cells…

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Population Genetics: The Hardy-Weinberg Equilibrium

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The Hardy-Weinberg equilibrium is a model that proposes allele (variations of a gene) and genotype (genetic makeup) frequencies within a population remain constant when the population is in equilibrium. If in equilibrium, were are able to calculate the allele and genotype frequencies for these populations. For a population to be defined as being in “Hardy-Weinberg…

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Mitosis: From a Mother to Twins

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Mitosis is a form of cell division that allows a mother cell to give rise to two daughter cells. The daughter cells are genetically identical to each other and to the mother cell. Mitosis involves nuclear division, where the duplicated DNA in the mother cell splits into two identical sets of chromosomes (one set for…

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A Basic Overview of the 4 Types of Human Tissue

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In order for us to complete are daily actions, we need our body to function as a whole. The body does this by having organs work together for different purposes. Our organs are made up of many tissues (sheets of cells) connected together to serve different purposes, to execute actions inside our body and help…

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Science Review of a Synapse

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A synapse is a structure that is essential to the function of the nervous system. This structure allows a neuron (a nerve cell)  to transmit a signal to a target cell, allowing communication between two cells. There are three main components in a synapse: the presynaptic neuron, the synaptic cleft and the postsynaptic cell. The…

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Exploring Corals

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Overview Coral has the appearance of a beautiful undersea garden,  but contrary to its appearance, coral is not a plant; it is technically classified as an animal. Coral reefs are located in over 100 countries around the world, and tend to thrive in warm climates. Habitat Because most varieties of coral have an optimal water…

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Science Review of Penguins

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Overview Penguins are flightless birds that spend most of their time in the ocean.  They are native to many locations in the Southern Hemisphere, including Antarctica, New Zealand, southern Australia, Chile, and Argentina.  They have unique coloration and markings, and most species are threatened or endangered. Types of Penguins There are 18 different species of…

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Science Review of Jellyfish

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Overview Jellyfish are found in all the world’s oceans, from the surface to the deep sea.  Most live in saltwater, although there are a few species that live in fresh water.  Jellyfish have soft bodies and swim freely for much of their adult lives. Kinds of Jellyfish There are hundreds of different species of jellyfish. …

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Science Review of Rays

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Overview Rays are fish that are close relatives of sharks.  There are over 600 species, and most live in tropical or subtropical marine environments.  Like sharks, their skeletons are made of cartilage rather than bone.  They live on the sea floor, and some species eat smaller fish, other bottom-dwellers such as crustaceans, and others eat…

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