Sci STAAR

• Ecosystem


  • Depend on biotic and abiotic components
• Organisms compete for


  Food
• Food web


  A system of overlapping and interconnected food chains
• The arrow in a food web


  Points to who is doing the eating
• Increase in biodiversity


  Bigger ecosystem
• Environmental changes affect the survival of species
• Environmental changes cause organisms to move, adapt, or die
• Short-term environmental changes cause organisms to move or die, long-term environmental changes cause organisms to adapt
• Environmental changes


  • Urbanization
  • Drought
  • Flood
  • Fire
  • Deforestation
  • Global warming
• Charles Darwin came up with the theory of natural selection
• Sustainability is important for the environment
• Relative atomic mass is calculated by multiplying the abundance of each isotope by its mass and then summing these products together.
• Skeletal


  • Supports body and protects
• Muscular


  • Movement
• Circulatory


  • Transports
• Respiratory


  • Gas exchange
• Excretory


  • Filters metabolic waste (pee)
• Reproductive


  • Produces offspring
• Integumentary


  • Protection, largest organ
• Digestive


  • Breaks down food
• Nervous


  • Communication by action (brain)
• Endocrine


  • Detects positive/negative responses
• Cell wall


  • Only in plants (skeletal)
• Chloroplast


  • Green, photosynthesis
• Cell theory


  Basic unit of life, basic structural function, all come from pre-existing cells
• Prokaryotic


  No nucleus
• Eukaryotic


  Has all parts of cell
• hello there eighth grade science students this is mrs geiss and can you believe it we have made it to the end of the year guys we have learned all of the new material that we were supposed to learn this year and now it is time to start preparing for the eog the eog for eighth grade will be on friday may 28th so we've got some time to prepare and we have a special learned notebook for you to help you with preparing to take the eog
• so go ahead and take out your 8th grade science review eog notebook and it is pink purpley color and let's go ahead and get started here we go
• In this review we're going to cover

  • Properties of matter including elements and compounds mixtures physical and chemical changes and conservation of matter
  • Energy the unit we just finished including how we obtain energy non-renewable sources renewable sources and energy that we use for life in our cells
  • The hydrosphere that was the unit we started way back at the beginning of the year including water on earth water systems safety and potability and water treatment
  • Earth's history we will be talking about earth planet earth rocks and fossils how we date rocks and fossils the method methods that we use and evidence that we have plate tectonics as well as changing life forms in our evolution and diversity of life unit
  • Biotechnology we will be talking about dna and genetics tools of biotechnology the benefits of biotechnology and ethical issues
  • Health and disease including disease-causing organisms epidemics and pandemics something we all know all too well right food and energy and healthy practices
  • Ecosystems including abiotic and biotic factors resources and interactions energy flow and the cycling of matter
• this unit review is not in the same order that we learned things this year okay just wanted to let you know that
• Atom


  Smallest unit of an element, still has the properties of that element
• All matter is composed of atoms
• Atoms have mass and occupy space
• Atoms of the same element have the same properties
• Proton


  Positive charge, located in the nucleus, measurable mass
• Neutron


  Neutral charge, located in the nucleus, measurable mass
• Electron


  Negative charge, orbiting the nucleus, negligible mass
• Element


  Composed of only one kind of atom, may link with bonds to form molecules
• Molecule


  Smallest unit of a compound, two or more atoms chemically combined