System

Scientists estimate that there are around ________ stars in our galaxy.

• 200

• 200 thousand

• 200 million

• 200 billion

• 200 trillion

Mercury, Venus, Earth, and Mars are known as _____________ planets.

• rocky

• gaseous

The gaseous planets are much larger than the rocky planets.

• True

• False

Tags

NGSS.MS-ESS1-3

About 99.85% of the mass of the solar system is the __________.

• Asteroid belt

• Sun

• Moon

• planets

Tags

NGSS.MS-ESS1-2

Scientists who study the solar system and outer space are called ______________.

• astronomers

• astronauts

Tags

NGSS.MS-ESS1-3

The inner and outer planets are separated by the __________.

• asteroid belt

• moon

• comets

• dwarf planets

Muscles are connected to bones by an elastic-like (stretchy) strap called a ______

• Joint

• Bone

• Tendon

• Muscle

Muscles that you can control are called ___________ muscles.

• Involuntary

• Voluntary

• Evolutionary

• Revolutionary

Muscles are attached to the skeletal system to

• Increase energy through the mitochondria.

• Protect the lungs and heart.

• To replace damaged muscle.

• Allow the bones to move.

Muscles cells will have more mitochondria cells than any other human cells because

• It produces the most protein

• It is red and red is hot

• It uses the most energy

• It needs to produce sweat when the body overheats.

Tags

NGSS.MS-LS1-7