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15
×
Which is the best example of a pure substance?
milk
peanuts
air
gold
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boom
Lose 50 points!
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gift
Win 15 points!
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rocket
Go to first place!
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banana
Go to last place!
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15
×
How can the rate of an infectious disease be drastically reduced?
by wearing clean clothing
by taking medication daily
by preventing transmission between people
by performing dental hygiene three times each day
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15
×
Which of these marine organisms is a producer in a marine ecosystem?
fish
worm
algae
gull
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banana
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fairy
Take points!
5
10
15
20
25
×
rocket
Go to first place!
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baam
Lose 20 points!
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15
×
Malaria is a common disease in many countries. What is the cause of this disease?
a bacterium
a parasite
a virus
a fungus
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thief
Give points!
5
10
15
20
25
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fairy
Take points!
5
10
15
20
25
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fairy
Take points!
5
10
15
20
25
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banana
Go to last place!
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15
×
Dino fossils are found in the btm layers of a rock cliff & mammal fossils in the mid layer.Why?
Dinosaurs lived on Earth before mammals.
Dinosaurs and mammals lived at the same time.
Dinosuars were eaten by mammals.
Dinosaurs ate plants.
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15
×
Which will most likely result if there is increased upwelling in a coastal area?
more aquatic life
higher water temperatures
fewer nitrates
less nutrients in the water
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15
×
In the U.S., which is responsible for ensuring the safety of the country's drinking water?
Center for Disease Control (CDC)
Environmental Protection Agency (EPA)
Food and Drug Administration (FDA)
National Oceanic and Atmospheric Administration (NOAA)
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15
×
Which best describes the characteristiscs of a river basin?
the land formed as a result of a river flooding
the land formed when rivers creat estuaries and marshes
land at the mouth of a river where H2O flows i/t the ocean
the land drained by a river and its tributaries
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15
×
If a chem reaction begins w/ 6 atoms of carbon, how many carbon atoms will be in the products?
2 atoms of carbon
6 atoms of carbon
12 atoms of carbon
3 atoms of carbon
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15
×
Which statement best describes the Law of Superposition?
In Sedimentary rock, the lowest layers are the older rocks.
Each sedimentary layer of rock repres. 1,000 yrs Earths age
The upper rock layers are older than the lower rock layers.
Rocks that form near volcanoes are older than other rocks.
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15
×
Which statement best explains how periods on the periodic table are organized?
increasing atomic number from left to right
decreasing atomic mass from left to right
decreasing number of electrons from left to right
increasing number of neutrons from left to right
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15
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Which best determines the health of a lake used as a source of freshwater?
its temperature and depth
its depth and width
its location and depth
its temperature and pH
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15
×
Why do doctors suggest that people get a flu vaccine each year?
Viruses are absorbed by the body after a year.
Viruses replicate more rapidly over time.
Viruses can mutate from year to year.
Vaccines get stronger over time.
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