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Whitehead
Early microbial ecologists knew that hydrogen gas is oxidized in soil and that ammonia is oxidized in sewage. How did these scientists determine that microbes are responsible for these ecological reactions? Choose one: A. by removing hydrogen gas and ammonia from soil and sewage samples and observing dead microbes under the microscope. B. by adding pure cultures to sewage samples and detecting the formation of nitrate C. by applying heat and antimicrobial treatment to sewage samples and observing that nitrate was no longer formed D. by preparing pure cultures from soil and sewage samples and observing their metabolic reactions in the laboratory
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Smokey
If more genes for less arm hair are passed on more frequently after several generations will people have more or less arm hair?
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Camilla Wagner
What kind of tissue is the precursor of long bones in the fetal skeleton?
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Ignacio
Why are old rocks rare on the ocean floor
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Genesis
What is a storage form of carbohydrate energy?
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Dallas Craig
How Do Soils Form?

A.

Erosion transports mineral particles, and plants die and decay.

B.

Plants provide organic matter and minerals to make soil.

C.

Weathering breaks rocks into minerals, and plants die and decay.

D.

Plants cement mineral particles together to form soil.
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Maryjane
Darwin noticed that birds that were good at finding scarce food in the winter had a better chance of surviving and producing offspring. What did he call this struggle for existence? artificial selection natural selection differential reproduction differential overproduction
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Bryanna Huffman
The chart below shows the codons that make up the genetic code and the sequence of nucleotides that corresponds to them. A mistake during DNA replication leads to a mutation in the nucleotide sequence shown below. This mutation results from the insertion of two nucleotides into the original sequence, which causes the reading frame of the sequence to change. This kind of mutation is known as
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Oscar Espinoza
The ability of an enzyme to change shape when it binds to its substrate is called
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Yasmine
Describe how a scientist using the phenic system would classify an organism.
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Barbie
A student made a model of an ecosystem inside a sealed plastic bottle. She placed soil, rocks, water, plants, and animals inside the bottle. How is the model different from a natural ecosystem?

A. The model lacks producers.

B. The model has more consumers.

C. The model lacks diversity.

D. The model has more predators.
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Mariam Mcclure
The scientific name of an organism is formed from what two parts of the organism's classification?
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Destiney Cohen
If the women does not get pregnant, then the corpus breaks down and the level of progesterone stars declining. Once progesterone decreases what happens to the lining of the uterus?
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Kallie Medina
The three stages in the development of a full tropical cyclone are formative, mature, and A. dissipation. B. damage. C. tornado. D. tropical cyclone.
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Yadiel Whitney
A 6-week-old baby had a cerebrospinal fluid shunt placed two days ago. the shunt is not draining the excess csf and the baby is returning to the or for shunt removal and replacement by the same surgeon who placed the original shunt. what cpt® code is reported for this surgery
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