Life Cycles  General Life Cycle: 1. Beginning of life 2. Growth and Development 3. Reproduction- animals reproduce during adulthood 4. Death ***Through reproduction, the cycle can begin again for the next generation. ***Death can happen at anytime.

Life Span  Tells you how long an animal can be expected to live.  The average life span of a human is years.

Complete Metamorphosis  In complete metamorphosis, the young DOES NOT resemble the adult.  Metamorphosis- A process of changes in form during an animal’s development  Most insects go through complete metamorphosis.  Complete Metamorphosis Insects: ◦ butterflies, silkworms, mealworms, ladybugs

Complete Metamorphosis ELPA will help ya remember complete metamorphosis: 1. Egg (laid by female animal) 2. Larva (worm-like, doesn’t resemble adult) 3. Pupa (the body changes form here) 4. Adult (fully-grown animal)

Butterfly Life Cycle Egg beginning of life Larva Growth and Development Caterpillar Growth and Development Pupa Growth and Development Adult Reproduction

What About Frogs?  Frogs also go through complete metamorphosis, but it’s different from ELPA.  Frog life cycle stages: 1. Egg 2. Tadpole (lives in water, breathes with gills) 3. Legs and lungs develop, tail and gills absorbed into body 4. Adult Frog (lives on land)

Incomplete Metamorphosis  A partial change in form 1. Egg 2. Nymph 3. Adult  Instead of the larva and pupa stages, these young insects are called nymphs and change a little more each time they molt or shed their exoskeletons. Examples: grasshopper, termites, dragonflies

What About Everybody Else?  All animals follow the general life cycle pattern.  Reptiles, birds, and fish begin the life cycle as an egg.  Mammals begin the life cycle with live birth.

Direct Development  Body changes through growth only  Examples: humans, dogs, dolphins