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What Makes Something Alive? · Living things share traits (grow, need energy and water, respond, reproduce) that nonliving things lack

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What Makes Something Alive?

with Atlas

Atlas the friendly explorer crouches in a sunny garden, magnifying glass in hand, comparing a sprouting bean plant beside a smooth gray rock on the soil.

List four traits that all living things share
Sort everyday objects into living and nonliving groups
Explain why a rock is not alive using the shared traits
Predict whether an unfamiliar object is living or nonliving and explain your reasoning using the four traits

Key terms

Living thing: Something that grows, eats, and makes babies.
Nonliving thing: Something that is not alive at all.
Respond: To react to something around you.
Reproduce: To make new living things like yourself.

Four Clues Of Life

Living things share four big clues. First, they grow and change, like a tiny seed becoming a tall plant. Second, they need energy and water to keep going. Third, they respond to the world, like a cat turning toward a sound. Fourth, they reproduce, which means they make new living things like themselves. If something does all four of these clues, then it is alive.

Why A Rock Is Not Alive

Let us look at a rock. Does it grow bigger by itself? No. Does it eat food or drink water on its own? No. Does it turn or react when you talk to it? No. Does it ever make baby rocks? No way! A rock does none of the four clues of life. That is how we know for sure that a rock is a nonliving thing, even though it sits in nature.

Tricky Movers

Some nonliving things can fool us. A wind-up toy car can zoom across the floor. Moving might make it seem alive, but moving is not one of our four clues. The toy car never grows, never eats on its own, and never makes baby cars. A real living thing does all four clues. So even a car that moves is still a nonliving thing because it cannot do the four clues of life.

Worked examples

Is a sunflower a living thing?

Check if it grows: a seed grows into a tall sunflower.
Check if it uses energy and water, responds, and reproduces.
A sunflower does all four clues of life.

Answer: Yes, a sunflower is a living thing.

Is a toy car alive because it moves?

Moving is not one of the four clues of life.
The toy car does not grow, eat on its own, or make baby cars.
It fails the four clues even though it can move.

Answer: No, a toy car is a nonliving thing.

Hi explorer, I'm Atlas! Today we figure out what makes something ALIVE. Look around you. A puppy, a tree, and you are all living. A rock, a spoon, and a toy car are nonliving. How can we tell them apart? Living things share four big clues. First, they GROW and change over time, like a tiny seed becoming a tall plant. Second, they NEED energy and water to keep going — animals get energy by eating food, while plants make their own energy using sunlight. Third, they RESPOND to the world, like a cat turning toward a sound or a plant leaning toward sunlight. Fourth, they REPRODUCE, which means they can make new living things like themselves. A rock does none of these. It never grows bigger, never uses energy or water on its own, never reacts, and never makes baby rocks. So a rock is nonliving! Scientists also notice that most living things breathe or take in air in some way — that's another clue you can look for as you learn more. Here's a tip if you feel stuck: ask, 'Does it grow, use energy and water, respond, and reproduce?' If yes to all four, it's alive. Let's practice sorting together.

Activity

Drag each object into the Living box or the Nonliving box

Practice

List the four clues that show something is alive.

Why is a wooden chair a nonliving thing now?

Common mistakes to avoid

Anything that moves is alive.Moving is not enough; living things grow, eat, respond, and reproduce.
A rock is alive because it is in nature.A rock does none of the four clues, so it is not alive.

Check your understanding

Which of these is a living thing?

Why is a rock NOT a living thing?

A toy car can move across the floor. Is it alive?

Recap

Living things share four clues: they grow, need energy and water, respond to the world, and reproduce. A rock does none of these, so it is nonliving. Use the four clues to sort anything you find.

Reflect

What living and nonliving things can you spot in your room?