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August 16, 2019
Claim
Evidence
Reasoning
CER
August 16, 2019
Oreos are the most popular cookie at my house.
My family buys two types of cookies: oreos and Snickerdoodles. Each comes in a box of 20. Oreos run out twice as fast as Snickerdoodles.
Because my family eats twice as many Oreos than Snickerdoodles, I know that Oreos are the most popular cookie.
Can you identify the "Claim," the "evidence," and the "reasoning" parts?
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What is a Claim?
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"Oreos are the most popular cookie at my house"
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Examples of Claims
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What is evidence?
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My family buys two types of cookies: oreos and Snickerdoodles. Each comes in a box of 20. Oreos run out twice as fast as Snickerdoodles.
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Examples of Evidence
• Results from experiments• Observations you make
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What is reasoning?
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Because my family eats twice as many Oreos than Snickerdoodles, I know that Oreos are the most popular cookie.
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Example 2
Question: Is recess good for kids health?
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CLAIMS: Are statements that you believe to be true and that answer a scientific question.
Should be a one-sentence answer to the question you investigated. It answers, what can you conclude?
TIPS:• Avoid using openings such as, “I think” or “I believe”
• Example: If the question is “How does air temperature affect the rate a cricket chirps” then your claim could be: "As air temperature rises, crickets chirp faster."
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EVIDENCE: Evidence is factual information or data from experiments that supports your claim. (e.g. observations, calculations, measurements)
Evidence MUST be from a RELIABLE source/text or experiment. Must have enough evidence to support your claim.
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REASONING:
Your explanation of how evidence supports the claim.
Shows how and why the data counts as evidence to support the claim.
Provides justification for why this evidence is important.
Includes one or more scientific principles that are important to the claim and evidence.
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Practice time!
Write a CER for how you solve the puzzle on the following page!
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Puzzle:
8 11 14 17 20
What number comes next?• Put your final answer in the "Claim" box• SHOW your work in the evidence box• WRITE your reasoning as to why your
claim is correct based on the evidence...
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What is your claim?
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What is your EVIDENCE?
(Did you actually write out the math and
show the work?)
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8+3=11
11+3=14
14+3=17
17+3=20
Each number in the series had the number 3 added to it
Evidence!
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Reasoning: How does the evidence support your claim?
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Reasoning possible answers:
• Based on the evidence that each number in the series had the number 3 added to it, we must conclude that the next number in the series will be 23 as 20 plus 3 is equal to 23.
• If all the numbers in the series had the number 3 added to them, then it would be logical to claim 23 as the next number since 20+3=23.
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Last year you studied the difference between plant cells and animal cells.
Look at the photo of the cell on your notes and read the CER that was written about the cell.
As a class we will identify which parts of the paragraph are the claim, evidence and reasoning.
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The diagram below shows an image of a cell taken from a Tasselled Wobbegong.
Question: Is the Tasselled Wobbegong a plant or animal?
Mitochondria
Nucleus
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Scientific Explanation (CER):The Tasselled Wobbegong is an animal. According to the image, the organism’s cell has a nucleus, cell membrane, and mitochondria, but it does not appear to have a cell wall or chloroplasts. Animal cells do not have cell walls because animals already have skeleton that gives them support, and animals do not have chloroplasts because animals get energy by eating food. Because the Tasselled Wobbegong’s cells are animal cells, the Tasselled Wobbegong must also be an animal. Directions:• Highlight/underline the claim in green• Highlight/underline the evidence in yellow• Highlight/underline the reasoning in red• Circle key scientific vocabulary (nucleus, cell membrane, mitochondria, cell wall, chloroplast)
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Now that you can identify the parts of a CER, let's work together to write one!
The table below shows the data that a scientist collected about a Helianthus californicus cell.
Organelle Nucleus Mitochondria Cell Membrane Cell Wall Chloroplast
Yes Unable to identify Unable to
identify Yes Yes
Question: Is the Helianthus californicus a plant or animal?
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What is our claim?(Make sure we restate the question in the claim)
The Helianthus californicus is a/an __________plant____________________.
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Evidence (Identify data that supports your claim)
According to the data table, the organism has _a cell wall and chloroplasts.________
__________________________________
__________________________________
__________________________________
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Reasoning(Connect the evidence to the claim using a scientific principle)
Cell walls and chloroplasts are only found in plant cells, never in animal cells.
__________________________________
__________________________________
Because the Helianthus californicus’s cells are ___plant______ cells, the Helianthus californicus must also be a ___plant______.
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It is time for you to write your own CER!
Complete CER #3: YOU DO
This is HW if you do not have time to finish in class. These will be collected at the start of next class and graded for accuracy!
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