Biology · Grades 1–4

Living things · Quick reference · Grades 1 to 4

Reference sheet for Grades 1 to 4: animal groups and life cycles. Sort animals by features you can check: milk for babies, feathers, gills, six legs, dry scales or moist skin.

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Rule and key idea

Animal groups

Sort animals by features you can check: milk for babies, feathers, gills, six legs, dry scales or moist skin.

mammals · birds · fish · insects · reptiles · amphibians

Which animal is a bird: an eagle or a cod? → an eagle

Life cycles

Every living thing goes through stages in order. Some animals, like frogs and butterflies, change shape completely.

egg → young → adult → new eggs

Which stage comes first in the life cycle of a frog: adult frog or egg? → egg

Check yourself

Four practice questions on this topic. Try each one before you open the answer.

In the life cycle of a ladybug, which stage comes right after “egg”?
- pupa
- larva
- adult ladybug
Show the answer
larva Life cycle of a ladybug: egg → larva → pupa → adult ladybug.
Which stage comes first in the life cycle of a butterfly: chrysalis or caterpillar?
- chrysalis
- caterpillar
Show the answer
caterpillar Life cycle of a butterfly: egg → caterpillar → chrysalis → adult butterfly.
Which stage comes first in the life cycle of a frog: tadpole or adult frog?
- tadpole
- adult frog
Show the answer
tadpole Life cycle of a frog: egg → tadpole → young frog → adult frog.
Which stage comes first in the life cycle of a frog: tadpole or young frog?
- young frog
- tadpole
Show the answer
tadpole Life cycle of a frog: egg → tadpole → young frog → adult frog.