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