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5. The frog
freezes solid.
1. The frog
starts as an egg.
6. In warmer
weather, the frog
thaws out!
6 Cells are the building blocks that make up
all living things. According to Olla, water drains
from the frog’s cells. It is replaced with a sugary
liquid that doesn’t freeze and protects the cells
from the cold. Then, the space between the
cells freezes, and the frog’s heart stops beating.
The frog seems to be frozen solid!
7 The frog can stay frozen for weeks or
months. When the temperature warms, the
process reverses. Sugar moves out of the frog’s
cells, and water moves back in. After a while,
the frog’s heart starts to beat again. If the
temperature changes often, the wood frog can
freeze and thaw many times.
2. The egg
hatches into 8 Olla says people often ask why she’s spent so
a tadpole. much time studying a little frog. “It doesn’t look
special,” she says. “But when you examine it
closely, you find it’s one of the most remarkable
creatures on Earth.”
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