8/17/2019 Pearson - All Animals Have Life Cycles http://slidepdf.com/reader/full/pearson-all-animals-have-life-cycles 1/10 Genre Comprehension Skill Text Features Science Content Nonfiction State the Purpose • Captions • Labels • Diagrams • Glossary Animal Life Cycles Scott Foresman Science 2.4 Standards Preview Standard Set 2. Life Sciences 2. Plants and animals have predictable life cycles. As a basis for understanding this concept: 2.b.Students know the sequential stages of life cycles are different for different animals, such as butterflies, frogs, and mice. ISBN 0-328-23504-0 ì<(sk$m)=cdfaej< +^-Ä-U-Ä-U Life Sciences by Kristin Cashore
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Living things grow and change. A kitten doesnot stay a kitten. It grows into an adult cat.
A life cycle is the way a living thing growsand changes. All animals have life cycles.
Cats have life cycles.
3
Every life cycle has stages. At each stage,the animal looks different. All animals changesize as they grow. Many animals also changeshape. Some animals even change color!
A caterpillar and abutterfly are part ofthe same life cycle.
Young Insects and AmphibiansAn insect is an animal with three body parts
and six legs. A ladybug is a kind of insect. Antsand butterflies are insects too.
Young insects look very different from theirparents. Insects change size, shape, and coloras they get older.
Ladybug eggs
An adult ladybug
7
An amphibian is an animal that lives partof its life in the water. It lives the other part ofits life on land. Newts are amphibians. Frogsand toads are also amphibians.
Young amphibians look different from theirparents. Amphibians change size, shape, andcolor as they get older.
How is the young newt(left) different from theadult newt (below)?
A toad is an amphibian. It starts life as anegg. The egg hatches and a tadpole swims out.A tadpole is a very young toad or frog.
A tadpole lives only in water. It has a tail,but it does not have legs. Soon the tadpolestarts to change. It grows back legs. Then itgrows front legs. Its tail starts to get smaller.
A toad egg
A young tadpole
An adult tadpole
9
Finally, the tadpole starts to look like a toad!An adult toad has four legs. It does not have atail. It can live on land or in the water.
A horse is a mammal. Baby horses are calledfoals. Foals look like their parents. Foals canstand up an hour after they are born!
A foal
A young horse
11
A female foal grows into a filly. A male foalgrows into a colt. Colts and fillies look more likeadult horses than foals. After two or three yearscolts and fillies become adult horses. Then they
A dragonfly is an insect. Its life cycle hasthree stages. A dragonfly starts life as an egg.
The dragonfly egg hatches. A youngdragonfly crawls out. It is called a nymph. Thenymph looks a lot like an adult dragonfly. It hasthree body parts and six legs. The nymph doesnot have wings.
dragonfly egg
nymph
15
The nymph grows bigger. It grows two setsof wings. Finally, it becomes an adult dragonfly!
The adult dragonfly may lay eggs. Then thelife cycle of the dragonfly starts over.