How animals grow and change and live

Science, Grade 3

How animals grow and change and live

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How animals grow and change and live

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How animals grow and change and live

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Study Guide How animals grow and change and live Science, Grade 3

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HOW ANIMALS GROW AND CHANGE Animals have certain traits which help them survive in their environment. These survival traits are called adaptations. Many adaptations are inherited, which means they are passed on from the parents of animal. Many animals have adaptations for eating such as the way a bird’s beak is shaped. Animals such as poisonous snakes have adaptations in the form of poison in their bodies that they can release. Lesson Checkpoint: What is an inherited trait? Life Cycles Animal grow and develop in many different ways as well. All animals grow and develop throughout their life cycle. A life cycle describes the stages an animal goes through from birth to death. Some vertebrates change their appearance a lot during their life cycle while others hardly change at all. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
It All Starts with an Egg The life of every animal starts off as an egg. Some animal babies develop from an egg INSIDE its mother and are then delivered as a live young. Other animals lay eggs OUTSIDE the mother’s body. The mother lays the eggs, the young develops inside the egg and then the eggs hatch after the young are developed and ready to be born. Lesson Checkpoint: What is a life cycle? The Butterfly’s Unique Life Cycle The life cycle of a butterfly is unique. A butterfly’s life cycle begins as an egg. After a butterfly lays an egg, a caterpillar soon hatches from that egg. A caterpillar is known as the larva stage. The caterpillar has to eat a lot during the larva stage in order to survive. A caterpillar sheds its skin many times as it grows. After the larva stage, the caterpillar spins a cocoon around itself forming a chrysalis. This is known as the pupa stage of the life cycle of a butterfly. An adult butterfly comes out of the cocoon, looking very different from the caterpillar it used to be, for now it has wings and jointed legs. Lesson Checkpoint: What does a caterpillar need to do during the larva stage in order to survive? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
The Frog’s Life Cycle Amphibians are vertebrates that change a lot during their life cycle, like the many changes a frog goes through during its life cycle. A frog has four main stages of its life cycle. An adult frog lays her eggs in the water. Tadpoles soon hatch from the eggs that the adult female laid. The newly hatched tadpole soon begins to lose its tail and grows legs back ones first than the front ones. Soon the tadpole becomes an adult with full-developed front and back legs and fully developed lungs. Adult frogs then live both on land and in water. Lesson Checkpoint: Where does an adult frog lay its eggs? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
How Animals Survive Animals need food, water, oxygen, and shelter to survive. Animals eat plants or other animals, or sometimes both, in order to survive. Animals get oxygen from the air or in water, which they need in order to survive. Many animals breathe through their lungs, but animals that live in water, such as fish, breathe with their gills. Lesson Checkpoint: Where do animals get oxygen from? Shelter as Protection Animals need shelter to protect themselves from bad weather and from animals that may eat them or harm them. Many animals have to build their own shelters, such as a bird that builds its own nest. Some animals, such as turtles and snails, carry their shelter right on their backs. Lesson Checkpoint: Why do animals need shelter? Other Protective Tricks Many animals have certain body characteristics that are used for protection such as camouflage. Some animals, such as rabbits, use their fur to blend in to their surroundings. This way, they are not always seen by predators. And some predators, such as snakes, use camouflage so that they are not seen before they catch their prey. A timber snake looks like a stick in the forest until it strikes to catch a field mouse. Many animals also use mimicry to protect themselves. Some flies without stingers, for example, look and sound like bees with stingers and they confuse their predators into thinking that they would be painful to eat or attack. The flies use mimicry to keep safe from more predators. Lesson Checkpoint: What is camouflage? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.