Chapter 2 Lesson 3: Animal Life Cycles

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Last updated 2:34 AM on 6/13/26
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21 Terms

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animal life cycle
The stages of growth, development, and reproduction that an animal goes through.
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metamorphosis
A series of distinct growth stages that are very different from one another.
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complete metamorphosis
A life cycle with four distinct stages where the young looks different from adults.
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larva
An immature stage that does not resemble the adult and often eats different food.
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pupa
A nonfeeding stage where the organism is active and changing inside a cocoon.
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incomplete metamorphosis
A life cycle with three stages where the young looks similar to the adult.
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nymph
A young insect that is smaller than an adult and lacks wings and reproductive structures.
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external fertilization
The joining of egg and sperm outside the female's body, usually in water.
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internal fertilization
The joining of egg and sperm inside the female's body to protect sex cells.
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embryo
A developing organism that is located inside of a fertilized egg.
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fertilization
The process of a sperm cell and an egg cell joining together to grow.
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egg
The first stage of the life cycle for most animals like birds and fish.
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adult
The final stage of a life cycle when an animal is fully grown.
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exoskeleton
A hard outer skeleton that insects must shed to make room for growing bodies.
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shedding
The process of an insect losing its old exoskeleton to allow for a larger body.
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yolk
The part of an egg that provides food for a developing embryo.
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sex cells
Delicate cells like sperm and eggs that must be protected for reproduction to occur.
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sperm cell
A male reproductive cell that joins with an egg cell during fertilization.
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egg cell
A female reproductive cell that joins with a sperm cell during fertilization.
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live young
Most mammals give birth to these instead of laying eggs on land.
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amphibians
A group of animals that typically use external fertilization in the water.