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8th Grade Science EOG Review 2023

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  • What 2 things are needed for organisms to complete cellular respiration?
    oxygen and glucose
  • Which pathogen is nonliving?
    Virus
  • Which symbiotic relationship is it when ALL organisms benefit from the relationship?
    Mutualism
  • The food chain shows how snakes participate in this ecosystem. plants → beetle → snake → hawk How would eliminating snakes affect this ecosystem?
    The beetle and hawk populations would increase
    Beetle popul would increase, hawk population would decrease
    Beetle popul would increase, hawk population would decrease
    The beetle and hawk populations would decrease
  • Which type of water (warm or cold) holds more dissolved oxygen?
    cold water
  • Which information can best help scientists determine if two different organisms are members of the same species?
    the physical structures of the organisms
    the diets of the organisms
    the behaviors of the organisms
    the habitats of the organisms
  • Butterflies and Birds both have wings but they are made of different materials, what is this an example of?
    Analogous Structures
  • Which symbiotic relationship is caused when one organism benefits by harming the other?
    Parasitism
  • Olivia finds two dinosaur fossils in a museum:  Apatosaurus fossil: 150 million years old  Diplodocus fossil: 154 million years old What evidence would show these organisms share a common ancestor?
    a 140-million-year-old Diplodocus fossil
    140-myo fossil with anatomical features of both
    a 160-million-year-old Diplodocus fossil
    160-myo fossil with anatomical features of both
  • Methane is a pure substance and exists as a gas at room temperature. Each methane molecule is made up of one carbon atom chemically bonded to four hydrogen atoms. How is methane classified?
    a homogeneous mixture
    a compoud
    an element
    a heterogenous mixture
  • Is Baking Soda (NaHCO3) an example of an element, compound, or mixture?
    Compound
  • What do we call the evidence that refers to organisms having a similar bone structure?
    Homologous Structures
  • How do plants contribute to the carbon cycle?
    They absorb carbon dioxide from the atmosphere for photosynthesis
  • How are viruses similar to parasites?
    They both need a host
  • Looking at a periodic table, how do you know that elements have similar properites?
    They will be in the same group.
  • Which symbiotic relationship results from one organism benefiting without helping or harming an organism?
    Commensalism
  • What does this represent?
    Mixture
  • What contains 2 or more substances chemically combined?
    Compound
  • What is the difference between a Pandemic and an Epidemic?
    Pandemics cover world wide; Epidemics are smaller localized areas.
  • What is used to treat a bacterial infection?
    Antibiotics
  • What does this represent?
    Element
  • What do we call a structure that an organism has left over from evolution, but the part serves no purpose anymore?
    Vestigual Structures
  • What is a pure substance that can't be broken down any farther?
    Element or compound
  • What pathogen spread by Mosquitoes causes Malaria?
    Parasite
  • What contains 2 or more substances physically combined?
    Mixture
  • Is Gold an example of an element, compound, or mixture?
    Element
  • How do viruses reproduce?
    They copy themselves in a host cell.
  • An unidentified pure solid is composed of an element. The substance is metallic and reacts vigorously when placed in water. Where is this element most likely found on the periodic table?
    at the bottom of the periodic table
    at the top of the periodic table
    on the right side of the periodic table
    on the left side of the periodic table
  • Does this pictures satisfy the law of conservation of mass? Why?
    Yes, both sides have the same things on it.
  • Why is most freshwater unavailable at any given time?
    It is frozen.
  • The diagram represents a region’s food chain. plants → squirrel → coyote Which change would increase the amount of carbon available to coyotes?
    an increase in the squirrel population
    introducing a species that competes with coyotes
    an increase in the coyote population
    introducing a species that competes with squirrels
  • What does this represent?
    Compound
  • What can be used to prevent viral infections?
    Vaccines