TedTest

From the Ted Talk by Thomas Boothby: Meet the tardigrade, the toughest animal on Earth

Unscramble the Blue Letters

Without water, a human can only survive for about 100 horus. But there's a creature so resilient that it can go without it for decades. This one millimeter animal can survive both the hottest and coldest environments on Earth, and can even withstand high levels of radiation. This is the tardigrade, and it's one of the tgosheut creatures on Earth, even if it does look more like a chubby, eight-legged gummy bear. Most organisms need water to survive. Water allows metabolism to occur, which is the pcesors that drveis all the biochemical reactions that take place in cells. But creatures like the tardigrade, also known as the water bear, get around this restriction with a process called anhydrobiosis, from the Greek meaning life without water. And however extraordinary, tardigrades aren't alone. Bacteria, single-celled organisms called archaea, plants, and even other animals can all survive drying up. For many tardigrades, this requires that they go through something called a tun satte. They curl up into a ball, pulling their head and eight legs inside their body and wait until wtear returns. It's thought that as water becomes scarce and tardigrades enter their tun state, they start synthesize special molecules, which fill the tardigrade's cells to replace lost water by forming a matrix. Components of the clels that are sensitive to dryness, like DNA, proteins, and membranes, get teparpd in this matirx. It's thought that this keeps these molecules locked in piiotson to stop them from ufinlondg, bnrieakg apart, or fisnug together. Once the organism is rehydrated, the matrix dissolves, leaving behind undamaged, functional cells. Beyond dryness, tardigrades can also tolerate other extreme stresses: being frozen, hateed up past the boiling point of water, high levels of radiation, and even the vacuum of outer space. This has led to some erroneous speculation that tardigrades are extraterrestrial beings. While that's fun to think about, scientific evidence paelcs their origin firmly on Earth where they've evolved over time. In fact, this etlahry eviltooun has given rise to over 1100 known species of tardigrades and there are probably many others yet to be discovered. And because tardigrades are so hardy, they esxit just about everywhere. They live on every continent, including Antarctica. And they're in diverse bmeios including deserts, ice sheets, the sea, fresh water, rainforests, and the highest mountain peaks. But you can find triagdrdaes in the most ordinary places, too, like moss or lichen found in yards, parks, and forests. All you need to find them is a little patience and a microscope. snieictsts are now to trying to find out whether tardigrades use the tun state, their anti-drying technique, to svirvue other stresses. If we can udsnatrned how they, and other ceteaurrs, stabilize their sensitive biological molecules, perhaps we could apply this klengwode to help us stabilize vaccines, or to develop stress-tolerant crops that can cope with Earth's changing climate. And by sdyunitg how tardigrades survive proongeld exposure to the vacuum of outer space, scientists can graeente clues about the eitnonmavrenl limits of life and how to safeguard astronauts. In the process, tardigrades could even help us answer a crctaiil question: could life survive on planets much less hospitable than our own?

Open Cloze

Without water, a human can only survive for about 100 _____. But there's a creature so resilient that it can go without it for decades. This one millimeter animal can survive both the hottest and coldest environments on Earth, and can even withstand high levels of radiation. This is the tardigrade, and it's one of the ________ creatures on Earth, even if it does look more like a chubby, eight-legged gummy bear. Most organisms need water to survive. Water allows metabolism to occur, which is the _______ that ______ all the biochemical reactions that take place in cells. But creatures like the tardigrade, also known as the water bear, get around this restriction with a process called anhydrobiosis, from the Greek meaning life without water. And however extraordinary, tardigrades aren't alone. Bacteria, single-celled organisms called archaea, plants, and even other animals can all survive drying up. For many tardigrades, this requires that they go through something called a tun _____. They curl up into a ball, pulling their head and eight legs inside their body and wait until _____ returns. It's thought that as water becomes scarce and tardigrades enter their tun state, they start synthesize special molecules, which fill the tardigrade's cells to replace lost water by forming a matrix. Components of the _____ that are sensitive to dryness, like DNA, proteins, and membranes, get _______ in this ______. It's thought that this keeps these molecules locked in ________ to stop them from _________, ________ apart, or ______ together. Once the organism is rehydrated, the matrix dissolves, leaving behind undamaged, functional cells. Beyond dryness, tardigrades can also tolerate other extreme stresses: being frozen, ______ up past the boiling point of water, high levels of radiation, and even the vacuum of outer space. This has led to some erroneous speculation that tardigrades are extraterrestrial beings. While that's fun to think about, scientific evidence ______ their origin firmly on Earth where they've evolved over time. In fact, this _______ _________ has given rise to over 1100 known species of tardigrades and there are probably many others yet to be discovered. And because tardigrades are so hardy, they _____ just about everywhere. They live on every continent, including Antarctica. And they're in diverse ______ including deserts, ice sheets, the sea, fresh water, rainforests, and the highest mountain peaks. But you can find ___________ in the most ordinary places, too, like moss or lichen found in yards, parks, and forests. All you need to find them is a little patience and a microscope. __________ are now to trying to find out whether tardigrades use the tun state, their anti-drying technique, to _______ other stresses. If we can __________ how they, and other _________, stabilize their sensitive biological molecules, perhaps we could apply this _________ to help us stabilize vaccines, or to develop stress-tolerant crops that can cope with Earth's changing climate. And by ________ how tardigrades survive _________ exposure to the vacuum of outer space, scientists can ________ clues about the _____________ limits of life and how to safeguard astronauts. In the process, tardigrades could even help us answer a ________ question: could life survive on planets much less hospitable than our own?

Solution

knowledge
drives
fusing
critical
places
generate
process
evolution
exist
state
scientists
understand
studying
tardigrades
breaking
toughest
unfolding
creatures
water
prolonged
position
heated
cells
earthly
matrix
trapped
hours
environmental
biomes
survive

Original Text

Without water, a human can only survive for about 100 hours. But there's a creature so resilient that it can go without it for decades. This one millimeter animal can survive both the hottest and coldest environments on Earth, and can even withstand high levels of radiation. This is the tardigrade, and it's one of the toughest creatures on Earth, even if it does look more like a chubby, eight-legged gummy bear. Most organisms need water to survive. Water allows metabolism to occur, which is the process that drives all the biochemical reactions that take place in cells. But creatures like the tardigrade, also known as the water bear, get around this restriction with a process called anhydrobiosis, from the Greek meaning life without water. And however extraordinary, tardigrades aren't alone. Bacteria, single-celled organisms called archaea, plants, and even other animals can all survive drying up. For many tardigrades, this requires that they go through something called a tun state. They curl up into a ball, pulling their head and eight legs inside their body and wait until water returns. It's thought that as water becomes scarce and tardigrades enter their tun state, they start synthesize special molecules, which fill the tardigrade's cells to replace lost water by forming a matrix. Components of the cells that are sensitive to dryness, like DNA, proteins, and membranes, get trapped in this matrix. It's thought that this keeps these molecules locked in position to stop them from unfolding, breaking apart, or fusing together. Once the organism is rehydrated, the matrix dissolves, leaving behind undamaged, functional cells. Beyond dryness, tardigrades can also tolerate other extreme stresses: being frozen, heated up past the boiling point of water, high levels of radiation, and even the vacuum of outer space. This has led to some erroneous speculation that tardigrades are extraterrestrial beings. While that's fun to think about, scientific evidence places their origin firmly on Earth where they've evolved over time. In fact, this earthly evolution has given rise to over 1100 known species of tardigrades and there are probably many others yet to be discovered. And because tardigrades are so hardy, they exist just about everywhere. They live on every continent, including Antarctica. And they're in diverse biomes including deserts, ice sheets, the sea, fresh water, rainforests, and the highest mountain peaks. But you can find tardigrades in the most ordinary places, too, like moss or lichen found in yards, parks, and forests. All you need to find them is a little patience and a microscope. Scientists are now to trying to find out whether tardigrades use the tun state, their anti-drying technique, to survive other stresses. If we can understand how they, and other creatures, stabilize their sensitive biological molecules, perhaps we could apply this knowledge to help us stabilize vaccines, or to develop stress-tolerant crops that can cope with Earth's changing climate. And by studying how tardigrades survive prolonged exposure to the vacuum of outer space, scientists can generate clues about the environmental limits of life and how to safeguard astronauts. In the process, tardigrades could even help us answer a critical question: could life survive on planets much less hospitable than our own?

Frequently Occurring Word Combinations

ngrams of length 2

collocation	frequency
high levels	2

Important Words

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