Study guides, Class notes & Summaries
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Grade 9 Science exam review (Ontario, Canada)
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Grade 9 Science exam review (Ontario, Canada) 
Decomposer - ️️ -An organismes such as bacteria and fungi that decomposes 
matter into nutrients 
trophic level - ️️ -each of several hierarchical levels in an ecosystem, comprising 
organisms that share the same function in the food chain and the same nutritional 
relationship to the primary sources of energy. 
Photosynthesis - ️️ -process by which plants and some other organisms use light 
energy to convert water and carbon dioxide int...
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Science Ch 7, Lessons 1-2 Every Solution Provided Is Correct And Faultless, Meeting The Requirements Of The Examination.
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matter - Answer anything that has mass and takes up space 
chemistry - Answer the study of matter and how matter changes 
substance - Answer a single kind of matter that is pure, meaning it always has a specific 
makeup, or composition 
physical property - Answer a characteristic of a substance that can be observed 
WITHOUT CHANGING it into another substance 
chemical property - Answer a characteristic of a substance that describes its ability to 
CHANGE into different substances 
element - Answ...
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2.4 Assignment: Investigating conductors and insulators
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2.4 Assignment: Investigating conductors and insulators 
 
 
Hypothesis: The hypothesis is that metals such as iron, zinc, magnesium, and lithium will conduct electricity and cause a light bulb to glow when connected to a circuit, based on the properties of the materials being tested. Conversely, non-metallic materials like glass, plastic, and pure water act as insulators, preventing the light bulb from illuminating when connected to a circuit
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BIOL 251 UNIT Test 1 quizes and answers 100% correct
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BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT Test 1 quizes and answers 100% correct 
BIOL 251 UNIT ...
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Study guide (Science) 100% Verified
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Study guide (Science) 100% Verified 
Science - answerA way of learning about the natural world. 
Observation - answerAn investigation based on inferences. 
Inference - answerA guess about an observation. 
law - answerDescription of how things happen in nature. 
Theory - answerAn explanation based on evidence, of why things happen. 
Hypothesis - answerA testable prediction that attempts to answer a question. 
Independent variable - answerWhat is being purposefully being changed. 
Dependent variab...
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Combined Science B Revision Package
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This package contains Revision papers with complete marking schemes well explained for exam preparations and to fit the current examination settings.
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OCR 2023 GCSE Combined Science B Twenty First Century Science J260/08: Combined science (Higher Tier) Question Paper & Mark Scheme (Merged)
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Two students are doing an experiment to investigate reaction times. The diagram shows their 
experiment. 
Tester 
Participant 
(a) The statements outline the method used. They are not in the correct order. 
(i) Write the letters in the boxes to show the correct order of the statements. 
The first one has been done for you. 
E 
[2] 
(ii) Suggest two improvements to the method that would ensure that the measurements 
taken were valid. 
Improvement 1 .................................................
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OCR 2023 GCSE Combined Science B Twenty First Century Science J260/06: Chemistry (Higher Tier) Question Paper & Mark Scheme (Merged)
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The combustion of fossil fuels for energy produces harmful substances. 
(a) (i) Draw lines to connect each harmful substance with the description of its major source. 
Harmful 
substance 
Major source 
[2] 
(ii) Explain one problem caused by increased amounts of sulfur dioxide in the atmosphere. 
........................................................................................................................................... 
...............................................................
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OCR 2023 GCSE Combined Science B Twenty First Century Science J260/05: Biology (Higher Tier) Question Paper & Mark Scheme (Merged)
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A doctor uses a light microscope to look at the chromosomes in human body cells. 
(a) The microscope is shown in the diagram. 
Fine focus 
Part A 
Part B 
Part C 
Coarse focus 
Mirror 
(i) Draw lines to connect each part of the microscope with its correct name. 
Part Name 
[1] 
(ii) The doctor uses steps A to D to look at the cells on a slide. 
The steps are not in the correct order. 
A Turn the coarse focus until the image is as clear as possible. 
B Turn the fine focus until the image is as cl...
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OCR 2023 GCSE Combined Science B Twenty First Century Science J260/04: Combined science (Foundation Tier) Question Paper & Mark Scheme (Merged)
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2 
© OCR 2023 
Stomach acid Clots the blood to prevent 
pathogens from entering cuts 
Skin Produces antibodies, or ingests 
and digests pathogens 
Platelet Barrier that prevents pathogens 
from entering the body 
White blood cell Can kill pathogens and stop 
them from reproducing 
1 Pathogens can cause diseases in humans. 
Draw lines to connect each defence mechanism with the explanation of how it functions. 
Defence mechanism Explanation 
[3] 
3 
© OCR 2023 Turn over 
2 (a) The plant geno...
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