Dịch đoạn văn sau
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As with many insects, the glow-worm's life is divided into four distinct stages: the egg, the larva
(equivalent to the caterpillar of a butterfly), the pupa (or chrysalis) and the adult. The glow-worm
begins its life in the autumn as a pale yellow egg. The freshly laid egg is extremely fragile but within
a day its surface has hardened into a shell. The egg usually takes about 35 days to hatch, but the
exact time varies according to the temperature, from about 27 days in hot weather to more than
45 days in cold weather. By the time it is due to hatch, the glow-worm's light organ is fully
developed, and its glow signals that the egg will soon hatch. After it has left the egg, the larva slowly
grows from a few millimetres into the size and shape of a matchstick. The larval stage is the only
time the insect can feed. The larva devotes much of its life to feeding and building up its food
reserves so that as an adult it will be free to concentrate all its efforts on the task of finding a mate
and reproducing. Throughout its time as a larva, approximately 15 months, the glow-worm emits
a bright light. The larva's light is much fainter than the adult female's but it can still be seen more
than five metres away. In the final stage of a glow-worm's life, the larva encases itself in a pupa)
skin while it changes from the simple larva to the more complex adult fly. When the adult fly
emerges from the pupa the male seeks a female with whom it can mate. After mating, the female
lays about 120 eggs. The adult flies have no mouth parts, can't eat and therefore only live a few
days. When people talk of seeing a glow-worm they normally mean the brightly glowing adult
female.
As with many insects, the glow-worm's life is divided into four distinct stages: the egg, the larva
(equivalent to the caterpillar of a butterfly), the pupa (or chrysalis) and the adult. The glow-worm
begins its life in the autumn as a pale yellow egg. The freshly laid egg is extremely fragile but within
a day its surface has hardened into a shell. The egg usually takes about 35 days to hatch, but the
exact time varies according to the temperature, from about 27 days in hot weather to more than
45 days in cold weather. By the time it is due to hatch, the glow-worm's light organ is fully
developed, and its glow signals that the egg will soon hatch. After it has left the egg, the larva slowly
grows from a few millimetres into the size and shape of a matchstick. The larval stage is the only
time the insect can feed. The larva devotes much of its life to feeding and building up its food
reserves so that as an adult it will be free to concentrate all its efforts on the task of finding a mate
and reproducing. Throughout its time as a larva, approximately 15 months, the glow-worm emits
a bright light. The larva's light is much fainter than the adult female's but it can still be seen more
than five metres away. In the final stage of a glow-worm's life, the larva encases itself in a pupa)
skin while it changes from the simple larva to the more complex adult fly. When the adult fly
emerges from the pupa the male seeks a female with whom it can mate. After mating, the female
lays about 120 eggs. The adult flies have no mouth parts, can't eat and therefore only live a few
days. When people talk of seeing a glow-worm they normally mean the brightly glowing adult
female.