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Complete or Incomplete? is a free printable Grade 3 science worksheet on comparing insect life cycles with and without a pupa stage, aligned to NGSS performance expectation 3-LS1-1. It prints 3 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 1 of 25 · the same problems every time you open this link.

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All 25 sets ask different questions.

Complete or Incomplete?

3-LS1-1

NameDate

Sort each insect into the right life cycle.

1.Sort each one: Complete: egg, larva, pupa, adult or Incomplete: egg, nymph, adult?

Sort: A mosquito, An ant, A dragonfly, A praying mantis

Complete: egg, larva, pupa, adultIncomplete: egg, nymph, adult
2.Sort each one: Complete: egg, larva, pupa, adult or Incomplete: egg, nymph, adult?

Sort: A cricket, A damselfly, A honeybee, A moth

Complete: egg, larva, pupa, adultIncomplete: egg, nymph, adult
3.Sort each one: Complete: egg, larva, pupa, adult or Incomplete: egg, nymph, adult?

Sort: A cockroach, A butterfly, A beetle, An earwig

Complete: egg, larva, pupa, adultIncomplete: egg, nymph, adult

LessonPrint · 3-LS1-1 · Set 1 · free to copy for classroom use

Answer key — Complete or Incomplete?

Set 1. Prints on its own sheet.

  1. 1.1. A dragonfly — Incomplete: egg, nymph, adult 2. A mosquito — Complete: egg, larva, pupa, adult 3. A praying mantis — Incomplete: egg, nymph, adult 4. An ant — Complete: egg, larva, pupa, adult
  2. 2.1. A cricket — Incomplete: egg, nymph, adult 2. A damselfly — Incomplete: egg, nymph, adult 3. A honeybee — Complete: egg, larva, pupa, adult 4. A moth — Complete: egg, larva, pupa, adult
  3. 3.1. A beetle — Complete: egg, larva, pupa, adult 2. A butterfly — Complete: egg, larva, pupa, adult 3. A cockroach — Incomplete: egg, nymph, adult 4. An earwig — Incomplete: egg, nymph, adult

Questions about Complete or Incomplete?

What does the Complete or Incomplete? worksheet cover?

It practices comparing insect life cycles with and without a pupa stage — 3 questions for Grade 3, all on NGSS 3-LS1-1: Model how life cycles differ, and what every one of them has in common. The instruction to students is “Sort each insect into the right life cycle”, and the answer key follows on the next sheet.

Which NGSS performance expectation does Complete or Incomplete? practice?

3-LS1-1, under Life Science for Grade 3. The published performance expectation reads: “Develop models to describe that organisms have unique and diverse life cycles but all have in common birth, growth, reproduction, and death.” The worksheet assesses that performance expectation rather than a paraphrase of it.

What age or grade is this worksheet for?

Complete or Incomplete? is written for Grade 3, typically ages 8-9. It is one of the sheets on 3-LS1-1, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.

Does Complete or Incomplete? come with an answer key?

Yes. All 3 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Complete or Incomplete? can I print?

25 — one per student, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Complete or Incomplete? free to print and photocopy?

Yes. Complete or Incomplete?, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

More practice for 3-LS1-1

Model how life cycles differ, and what every one of them has in common.

All Grade 3 worksheets

Last reviewed 2026-09-05. Aligned to 3-LS1-1 of the Next Generation Science Standards.