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What plant is called the Dynamite tree?

The sandbox tree

The pomegranate

The cladrastis tree

The western catalpa

Hura crepitans, the sandbox tree, also known as possumwood and jabillo, is an evergreen tree of the spurge family (Euphorbiaceae), native to tropical regions of North and South America, including the Amazon Rainforest. It has also been known as the Dynamite tree, so named for the explosive sound of the ripe fruit as it splits into segments. This tree prefers wet soil, and partial shade or partial sun to full sun. It is often cultivated for shade.

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How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

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What was the purpose of the Eratosthenes sieve?

to check whether a given number is divisible by 7

to round numbers to 10 decimal places

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for finding all prime numbers up to any given limit