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What function do the alveoli perform?
• exchange oxygen in the air for carbon dioxide in the blood • hold receptors for the
1 answer
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one
101 views
CaCO3→CO2+CaOCaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3CaCO3) in the chemical reaction shown. What
3 answers
asked by
one
240 views
Which organ in the excretory system filters blood?
• urethra • ureter • kidney • bladder
1 answer
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one
142 views
Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O) to form 10 molecules of carbon dioxide (CO2CO2). According to
1 answer
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one
262 views
What is the primary function of the muscular system?
• secreting protective oils • protection from foreign invaders •
4 answers
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one
305 views
What motion of the skeleton involves putting your hand out straight and then turning it over and back again?
• opposition •
4 answers
asked by
one
320 views
Why is urbanization associated with the Industrial Revolution?
• The expansion of family farms refocused the nation on
1 answer
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one
128 views
Suppose 20 atoms of hydrogen (H) react with chlorine (Cl) to produce 20 molecules of hydrochloric acid (HCl). According to the
1 answer
asked by
one
169 views
Which element has the same number of valence electrons as bromine (Br)?
• potassium (K) • krypton (Kr) • selenium (Se) •
1 answer
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two
225 views
Why are sodium (Na) and potassium (K) in the same group on the periodic table?
• They are both colorless. • They have similar
1 answer
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two
205 views
Which cells carry nutrients from food to the rest of the cells in the body?
• nerve cells • blood cells • stomach cells •
1 answer
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two
131 views
How are blood cells and stomach cells similar?
• Both secrete enzymes. • Both help maintain homeostasis. • Both send
5 answers
asked by
two
387 views
In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about
1 answer
asked by
TWO
91 views
How do the terms genotype and phenotype relate?
• An organism’s phenotype leads to its genotype. • An organism’s genotype
1 answer
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TWO
103 views
In which situation are unbalanced forces acting on an object?
• Two people stand on the same side of a large tire. One person
4 answers
asked by
TWO
354 views
How have the historic levels of melanin in human populations changed due to migration?
• Humans that produced less melanin
1 answer
asked by
TWO
76 views
A baseball has a mass of 145 g. A pitcher throws the baseball so that it accelerates at a rate of 80 m/s2. How much force did
5 answers
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TWO
325 views
Which unit is used to measure force?
• kilogram • joule • newton • watt
5 answers
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TWO
450 views
A baseball collides with a baseball glove. Which equation is used to calculate the force the glove exerts on the ball during the
3 answers
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TWO
470 views
A 0.2-kilogram softball is thrown toward a catcher’s mitt. The ball is accelerating at a rate of 8 meters per second squared.
2 answers
asked by
TWO
161 views
A tennis player hits a 0.1-kilogram tennis ball with her racket from the north end of a court. Her racket was traveling at 65
3 answers
asked by
TWO
344 views
In which situation would a snake be expected to have the largest size?
• lots of space, inadequate food • lots of space,
3 answers
asked by
TWO
336 views
What is the name for one half of a chromosome?
• chromatid • gene • centromere • protein
3 answers
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TWO
188 views
Rabbits are very popular domesticated animals, so popular that there are over 300 breeds of domesticated rabbits in the world.
1 answer
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TWO
132 views
A student investigated the effect of root space on plant growth. The student grew two groups of plants of the same variety. Both
1 answer
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TWO
191 views
A student investigated the effect of root space on plant growth. The student grew two groups of plants of the same variety. Both
1 answer
asked by
TWO
198 views
Natural selection causes changes in
• phenotypes. • genotypes. • individuals. • populations.
1 answer
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TWO
84 views
How have the historic levels of melanin in human populations changed due to migration?
• Humans that produced less melanin
4 answers
asked by
TWO
268 views
Which statement is correct about a bottleneck event?
• A bottleneck event increases the gene pool of a population. • A
3 answers
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TWO
121 views
Researchers plotted a distribution curve for leg length in a population of birds, with length from short to long on the x-axis.
4 answers
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TWO
325 views
Turkey vultures eat carrion, which is decaying animal matter, like roadkill. How are they classified?
• omnivore • autotroph
3 answers
asked by
TWO
297 views
In a food chain, with each feeding relationship, the energy transferred from one organism to another will
• be independent of
1 answer
asked by
TWO
246 views
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