Life Through Time

Overview

Students explore a simplified picture timeline showing major changes in life on Earth, from early simple life to modern humans. They practice sequence words—first, next, then, and now—and retell the story through pictures, movement, drawing, and dictation.

Teacher note: Evolution happens gradually over a very long time. This timeline is a simplified model and does not show every species or every step. It also does not mean that humans came from modern monkeys. Humans and modern monkeys share very distant ancestors. Use calm, non-graphic images and emphasize curiosity, change, and respect for all life.

Learning intentions

Students will be able to:

• use first, next, then, and now to describe a sequence.
• notice that living things have changed over a very long time.
• identify broad milestones in the history of life.
• explain that humans are part of the story of life.
• draw, dictate, or write a simple sequence of events.

Success criteria

• I can put picture cards in an order that makes sense.
• I can use first, next, then, and now when I retell the timeline.
• I can tell one way life changed over a very long time.
• I can show what I learned with a drawing or words.

Vocabulary

• first
• next
• then
• now
• long ago
• change
• life
• human
• timeline

Curriculum links

• Reading science and technical texts: identify the main idea and give an accurate summary based on the text or pictures.
• Reading science and technical texts: connect information in words with information shown in pictures and a timeline.
• Reading science and technical texts: follow a multistep procedure when completing a sorting or movement task.
• Writing: use drawing, dictation, or writing to tell events in the order in which they happened.

Lesson structure (45 minutes)

1. 0–5 min · Warm-up. Teacher displays a baby photo and an adult photo, then asks, “What changed?” and introduces “first” and “now” using the opening comparison slide. Students turn to a partner, describe one change, and practice saying, “First… Now…”

2. 5–12 min · Explicit teaching. Teacher presents the six broad milestones with the picture timeline slides: early simple life, sea life, dinosaurs, early mammals, early human relatives, and Homo sapiens/modern humans. Students repeat the sequence words and use gestures for “first,” “next,” “then,” and “now.” Explain that each picture represents a very long period of time and that the pictures are a simplified model.

3. 12–23 min · Interactive picture-card timeline. Teacher places mixed picture cards around the room or at group tables and models checking the order from left to right. In groups of four, students sort the cards using the picture timeline sorting and recording sheet as a guide, then explain why each card belongs where it is. Students may use the six picture headings and arrows on the worksheet to record or draw the sequence. Pause to check: “Which came before dinosaurs?” and “Which picture shows life now?”

4. 23–30 min · Movement timeline. Teacher assigns six classroom spaces as timeline stops and rereads the sequence from the movement timeline prompt slide. Students walk quietly to the correct stop when the teacher names a milestone, then freeze and make a safe, simple movement: wiggle fingers for tiny early life, wave arms for sea life, stomp gently for dinosaurs, curl like a small mammal, walk carefully like an early human relative, and stand tall for modern humans. Students say the sequence word as they move: “First,” “next,” “then,” or “now.”

5. 30–39 min · Partner retell and response. Teacher models a short retell: “First, early simple life lived long ago. Next, life lived in the sea. Then came dinosaurs, early mammals, and early human relatives. Now, Homo sapiens—modern humans—are here.” Partners take turns retelling with the partner retell prompt slide and complete one response on the drawing and sentence section. Students draw the timeline or one important change and dictate, copy, or write: “Life changed over a very long time. Now humans are part of the story.”

6. 39–45 min · Formative assessment and closing. Teacher shows the final sequence on the review and exit prompt slide and invites students to share one idea. Students complete an oral or drawn exit response: “First was ____. Now there are ____.” Collect responses and listen for correct order, sequence words, and the understanding that humans are part of life’s history.

Resources

• the complete picture timeline slide deck
• the picture timeline sorting and recording sheet
• Six large, teacher-prepared picture cards or projected milestone images
• Open floor space or six labeled classroom locations
• Crayons, pencils, and clipboards
• Board or chart paper
• Sticky notes or tape
• Non-graphic, child-appropriate images of life through time

Assessment

• During sorting, ask students to justify the order using “first,” “next,” “then,” and “now.”
• During partner retells, note whether students identify at least three milestones in a sensible sequence and understand that the timeline shows very long-term change.
• Review the drawing, dictated sentence, or exit response for sequence, accurate use of pictures, and the idea that modern humans are part of the story of life.

Differentiation

• Support students with a four-part oral frame: “First ____. Next ____. Then ____. Now ____.” Offer picture symbols, repeated modeling, and the option to point, draw, or dictate.
• Pair multilingual learners with supportive peers and preview gestures for the sequence words. Accept home-language discussion before an English retell where appropriate.
• For students needing motor or attention support, provide a smaller card set, a seated version of the movement activity, and clearly marked spaces.
• Challenge ready students to add a fifth sequence word, such as “after that,” or explain one visible change between two pictures without suggesting that change happened quickly.

Safety and sensitivity notes

• Use only calm, non-graphic images; avoid pictures of injury, death, frightening dinosaurs, or upsetting scenes.
• Remind students to walk, keep hands to themselves, and use gentle movements during the timeline activity.
• Present the topic as a scientific model for noticing patterns, not as a complete list of every living thing.
• Respect family beliefs and questions. Say, “Scientists use evidence to study how living things change over time,” and invite questions without asking students to debate personal beliefs.

Extension

• Students draw a four-part timeline using first, next, then, and now and dictate one sentence for each picture.
• Invite students to choose a living thing they know and explain how it is part of the larger story of life.