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Biology

mitochondria → makes ATP
ATP = the cell’s energy
“powerhouse of the cell”
has its own DNA (!)
more in muscle cells

Anatomy

heart → pumps blood
4 chambers:
2 atria (top)
2 ventricles (bottom)
left side → whole body

Math

addition
1 + 2 = 3
order doesn’t matter:
2 + 1 = 3 too
→ commutative!

Math

zero
adding 0 changes
nothing:
1 + 0 = 1
7 + 0 = 7

Physics

speed of light
≈ 300,000 km/s
sun → earth:
about 8 minutes
nothing goes faster

Have fun.

Every question in these games comes from a study set. Try one now with a sample addition deck — no account needed.

Star DefenderSample deck · Addition

Star Defender: enemy ships each carry an answer to “What is 1 + 2?”, and the player’s ship aims at the right one

Shoot the ship carrying the right answer. Build your combo, survive the waves.

PongSample deck · Addition

Pong: answer balls labelled 1 and 7 move across the court for the question “What is 1 + 0?”

Hit the ball with the right answer. Dodge every wrong one.

Also in every set Brain Trivia · Flashcards · Practice tests · Rapid Fire

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Bio — ch. 4

photosynthesis = light → sugar

happens in the chloroplasts

makes glucose + O₂

needs CO₂ + water

A page of handwritten biology notes.

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Question 1 of 12Edit

What does photosynthesis produce?

  • Carbon dioxide
  • Glucose and oxygen
  • Only water
The question Study64 generates from those notes, with an edit button.

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