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What Every Living Thing Needs to Survive · Needs and Survival · living things · basic needs

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What Every Living Thing Needs to Survive

with Lumi

Lumi kneels in a sunlit garden beside a tomato plant, an earthworm in the soil, and a buzzing bee, holding up a watering can and pointing to the bright sun overhead while wearing a green explorer vest.

Identify the four basic needs that most living things — especially plants and animals — share to stay alive.
Explain why each basic need — energy, water, air, and a place to live — matters for survival.
Compare how different living things meet the same basic need in different ways.
Predict what would happen to a living thing if one of its basic needs was not met.

Key terms

Basic needs: Things a living thing must have to live.
Energy: The power to grow, move, and live.
Oxygen: A gas in the air that living things need.
Habitat: A place where a living thing can live.

Energy And Water

Every living thing needs energy to grow, move, and play. Plants get energy from sunlight and use it to make their own food. Animals, including you, get energy by eating food like fruit or a sandwich. Living things also need water. Water helps blood carry food around an animal's body, and it moves goodness up through a plant's stem. Without water, living things dry out and cannot stay alive.

Air And A Place To Live

Most living things need air to live. Animals breathe in a gas called oxygen, even fish, who pull it out of water with their gills. Plants take in a gas called carbon dioxide to help make their food. Living things also need a place to live, called a habitat. A bird needs a branch for its nest, a cactus needs sandy soil, and a fish needs a pond. The home keeps them safe and fed.

All Four Needs Matter

A living thing needs all four basic needs to survive. These are energy, water, air, and a place to live. If even one need is missing, the living thing cannot stay healthy for long. A plant in a dark closet has water and air but no sunlight, so it weakens and dies. This is why we call them basic needs. They are not extra, they are must-haves for every living thing.

Worked examples

What happens to a plant kept in a dark closet?

A plant needs sunlight to make its energy.
A dark closet has no sunlight at all.
Without energy the plant cannot survive, even with water and air.

Answer: The plant weakens and dies because it has no light for energy.

How does a fish meet its need for air?

All animals need oxygen from the air.
A fish lives underwater and cannot breathe like we do.
It uses its gills to pull oxygen right out of the water.

Answer: A fish gets oxygen from the water through its gills.

Hey there, explorer! I'm Lumi, and today we're going to uncover something amazing that YOU share with every plant and animal on Earth. Most living things — from a mighty oak tree to a little ant to you — need four things to stay alive. Let's go through each one. First: ENERGY. Energy is the power that lets living things grow, move, and do everything they do. Plants get energy from sunlight — they use it to make their own food. Animals (including you!) get energy by eating food, whether that's a leaf, a berry, or a sandwich. Second: WATER. Every living cell needs water to work properly. Water makes up most of your blood and helps it carry food and oxygen to every part of your body. Water also moves nutrients through a plant's stem. Without water, living things dry out and cannot survive. Third: AIR. Most living things need a gas from the air called oxygen to release the energy from their food. Even fish get oxygen — they pull it right out of the water through their gills. Plants also take in a gas called carbon dioxide from the air to make their food. (Interesting fact: some very tiny organisms like certain bacteria can survive without oxygen, but for plants and animals, air is essential!) Fourth: A PLACE TO LIVE (also called a habitat). Every living thing needs a space where it can find food and water and stay safe. A robin needs a tree branch for its nest. A cactus needs dry, sandy soil. A goldfish needs a pond or tank. Shelter — like a nest, burrow, or den — is one way animals meet this need for a place to live. Here's the key idea to remember: if ANY one of these four needs is not met, a living thing cannot survive for long. That's why scientists call them BASIC NEEDS — they are not optional!

Activity

Sort each example into the basic need it shows being met: Energy, Water, Air, or Place to Live.

Practice

Name the four basic needs of most living things.

How does a plant get its energy compared to an animal?

Common mistakes to avoid

Plants do not need air.Plants take in carbon dioxide from the air to make food.
Rocks have needs too.Rocks are not alive, so they have no basic needs at all.

Check your understanding

A seedling is placed in a dark closet with plenty of water and air. What will most likely happen to it over time?

Which of the following BEST explains why fish are living things even though they live underwater and cannot breathe air like we do?

Which statement best explains why rocks do NOT have basic needs?

Recap

Most living things need four basic things to survive: energy, water, air, and a place to live. If even one of these needs is missing, a living thing cannot stay healthy and alive for very long.

Reflect

Which basic need do you think about the most each day?