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Unit 2 READING 1
W e can find sea stars in every ocean of the
world. Some sea stars cling to the ocean
reefs and rocks, while others prefer to be on the
sandy sea floor.
Sea stars have no brain. Instead, they have
special cells on their skin that act like a brain.
Sea stars do not have eyes, either. However,
they have “eye spots” on the tips of their arms.
The eye spots sense light and darkness. The
mouth on the sea star is on the center of the underside of the animal’s body.
You might be surprised at their ability to grow an entire new limb when one
is injured or broken off. In that way, some sea stars can live for a very long
time.
There are also some threats. Sea stars need clean water to live in. However, a
lot of pollutants run into the oceans, and that makes sea stars get very sick
and die. Furthermore, sea stars are losing their living place because of
global warming. For the sea stars, .
English Usage
• subject + verb, while subject + verb
- We can usually use ‘while’ to balance two facts or ideas that contrast, but
don’t contradict.
Some people like swimming in the sea, while others like mountain climbing.
While some languages have more 20 vowel sounds, others have five or less.
106 Chapter 5 Science
W e can find sea stars in every ocean of the
world. Some sea stars cling to the ocean
reefs and rocks, while others prefer to be on the
sandy sea floor.
Sea stars have no brain. Instead, they have
special cells on their skin that act like a brain.
Sea stars do not have eyes, either. However,
they have “eye spots” on the tips of their arms.
The eye spots sense light and darkness. The
mouth on the sea star is on the center of the underside of the animal’s body.
You might be surprised at their ability to grow an entire new limb when one
is injured or broken off. In that way, some sea stars can live for a very long
time.
There are also some threats. Sea stars need clean water to live in. However, a
lot of pollutants run into the oceans, and that makes sea stars get very sick
and die. Furthermore, sea stars are losing their living place because of
global warming. For the sea stars, .
English Usage
• subject + verb, while subject + verb
- We can usually use ‘while’ to balance two facts or ideas that contrast, but
don’t contradict.
Some people like swimming in the sea, while others like mountain climbing.
While some languages have more 20 vowel sounds, others have five or less.
106 Chapter 5 Science
