• 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

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-LS1-6

NGSS.MS-LS2-3

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?

• 
• 
• 
• 

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

List the steps of the scientific method

d

e

f

c

b

a

Form a hypothesis

Communicate results

Conduct experiment

Analyze results

Ask a question

Draw conclusions

Tags

NGSS.MS-LS1-5

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?

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

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

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

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

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

What is the primary function of the mitochondria in cells?

• Photosynthesis

• Protein synthesis

• Energy production

• Cell division

Tags

NGSS.MS-LS1-2

Which of the following elements is a noble gas?

• Oxygen

• Nitrogen

• Helium

• Hydrogen

What is the chemical formula for table salt?