• Sea stars learn how to regrow their arms

• Sea stars inherit the ability to regrow their arms

• Sea stars eat food that causes their arms to regrow

• Sea stars move to warmer water that causes their arms to regrow

Tags

NGSS.MS-LS1-5

A student took pictures of the Moon on different days. Which set of pictures did the student take on Sunday, Wednesday, and Saturday of the same week?

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Tags

NGSS.MS-ESS1-1

The diagram shows parts of an ecosystem. Which of the following is the source of all the energy in the ecosystem?

• Air

• Grass

• Hawk

• Snake

• Sun

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

A carpenter wants to use magnets to help keep a cabinet door closed. The carpenter also wants to make sure the cabinet door does not hit a nearby wall when the cabinet door is opened. Which diagram shows how the carpenter should place the magnets?

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Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

A student is testing different types of wood to use for a bookshelf. The student tests each type of wood to predict how many books the bookshelf will safely hold. Which of the following characteristics of the wood determines how many books the bookshelf can safely hold?

• flexibility

• hardness

• strength

• weight

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Which of the following diagrams correctly shows how water can move through the water cycle from an ocean to a lake?

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Tags

NGSS.MS-ESS2-4

Which of the following best explains why more water flows in a river in Worcester in spring than in other seasons?

• The melting snow in spring causes more runoff.

• The high winds in spring push on the river at a greater speed.

• The average high temperature in spring results in fewer rainstorms.

• The average low temperature in spring causes less water to evaporate from the river.

Tags

NGSS.MS-ESS2-4

The diagram shows water particles in three different phases. On a summer day, water particles from the ocean change phase as they move into the air. Which of the following models best shows this process?

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Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

A dog trainer designed a device to launch a ball into the air for a dog to catch. The device launches the ball when a sandbag is dropped on the lever shown. The trainer wants to be able to launch the ball one meter into the air. Which set of steps should the dog trainer follow to make sure the device launches the ball to the correct height?

• 1. Drop the sandbag. 2. Listen for a sound. 3. Replace the sandbag with something that weighs the same. 4. Repeat all steps until the ball reaches exactly one meter.

• 1. Drop the sandbag. 2. Measure how high the ball reaches. 3. Replace the sandbag with something that has a different shape. 4. Repeat all steps until the ball reaches exactly one meter.

• 1. Drop the sandbag. 2. Add electrical energy to the system. 3. Replace the sandbag with something that weighs the same. 4. Repeat all steps until the ball reaches exactly one meter.

• 1. Drop the sandbag. 2. Measure how high the ball reaches. 3. Adjust the energy of the sandbag by holding it at a different height. 4. Repeat all steps until the ball reaches exactly one meter.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-4

Two substances, substance A and substance B, react to form substance C. Substance A has a mass of 40 g, and substance B has a mass of 70 g. The reaction takes place in a closed system. Which of the following graphs best represents the mass of each substance?

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5