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Which Evidence Supports What is a free printable Grade 4 English worksheet on matching a piece of evidence to its claim, aligned to Common Core standard RI.4.8. It prints 2 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Which Evidence Supports What

RI.4.8

NameDate

Read the text, then answer the questions.

1.Read the text, then answer the questions.

The Wolves and the Rivers

Wolves were shot out of Yellowstone by 1926. Fourteen were brought back in 1995. With no wolves, elk had grazed the valleys freely for seventy years. Young willow and aspen were eaten as soon as they grew. The wolves killed some elk. More importantly, they changed where elk would stand still. Open valley floors became dangerous, so the elk stopped lingering there. Willow and aspen grew back along the rivers. Beavers, which need willow, returned. Their dams made ponds. Roots held the banks. The rivers narrowed, deepened and moved less. Some researchers describe this as wolves changing the shape of rivers, though others argue the effect has been overstated.

  1. 1. The author reports a disagreement. What is it, and how is it presented?
  2. 2. What is the author's purpose, and how do you know?
2.Read the text, then answer the questions.

What a Coral Reef Is

A coral reef looks like rock and is built by animals. A coral polyp is a soft creature the size of a pinhead. It draws calcium from the sea water and builds a hard cup around itself. Millions of polyps, cup upon cup, become a reef. Inside each polyp live tiny algae. The algae make food from sunlight and pass most of it to the polyp. In exchange they get shelter and the polyp's waste. Neither could build a reef alone. When the water gets too warm, the polyps expel the algae. Without them the coral turns white and starves. That is what bleaching means. A reef takes centuries to build and can bleach in a single hot summer.

  1. 1. What is the author's purpose, and how do you know?
  2. 2. The text says neither organism could build a reef alone. What evidence supports that?

LessonPrint · RI.4.8 · Set 2 · free to copy for classroom use

Answer key — Which Evidence Supports What

Set 2. Prints on its own sheet.

  1. 1.1. Some researchers credit wolves with reshaping rivers; others say the effect is overstated — both are reported without choosing. 2. To explain a chain of effects and be honest about the dispute — the last sentence gives both sides.
  2. 2.1. To explain what a reef is and why it is fragile — the last line makes the contrast explicit. 2. The algae make the food; the polyp makes the cup and gives them shelter.

Last reviewed 2026-09-05. Aligned to RI.4.8 of the Common Core State Standards for English language arts.