What is a trigger for opening a sequoia cone?

frost

fire

flood

earthquake

Young sequoias are able to grow successfully only in mineral soils in full sunlight, free from competing vegetation. They therefore require periodic wildfire to clear the area. Due to very thick bark, the fire doesn't harm sequoia.

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How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

How deep is the root system of a giant sequoia?

How many chromosomes does a mule have? (A horse has 64, a donkey has 62)

It is infertile and does not have chromosomes

Which bird is known to have stiff tail feathers?