Why do classification systems change over time?
O Scientists find new evidence in their studies.
O Scientists use old methods of classification.
O Scientists repeat experiments and find no changes.
O Scientists find similar evidence to previous work.

Classification systems change over time because scientists find new evidence in their studies. So, the correct option is (A).

There are many types of classification systems that are used for different purposes. The classification of organisms takes place in the form of a classification system called Linnaean classification.

Linnaean classification involves the use of organisms grouped using a hierarchy called taxa which includes taxonomic levels and taxonomic groups that animals are placed in based on their characteristics and even shared ancestry.

The different levels of biological classification are as follows:

Species » Genus » Family » Order » Class » Phylum » Kingdom » Domain

It changes over time as scientific studies find new evidence.

Thus, classification systems change over time because scientists find new evidence in their studies. So, the correct option is (A).

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Phototropism is a phenomenon observed in plants. Phototropism is best described as a plant’s response to light. Auxin is a hormone and signaling molecule found in plants that promotes cell elongation. It is observed that auxin concentrations are lower in the parts of the plant that are closest to light. Auxin concentrations are higher in the parts of a plant that are in the shade.

Answer the following in the space provided.
A. Describe phototropism using what you know about signal transduction. Start with auxin as a signaling molecule.
B. Explain how altering the receptor would affect the signaling pathway.
C. Predict how a plant would respond to exposure to light on all sides of a growing stem.
D. Provide reasoning and justification for your prediction.

For recessive trait to be expressed you need to receive the allele from both parents. True or false

(Free Response) Phototropism is a phenomenon observed in plants. Phototropism is best described as a plant’s response to light. Auxin is a hormone and signaling molecule found in plants that promotes cell elongation. It is observed that auxin concentrations are lower in the parts of the plant that are closest to light. Auxin concentrations are higher in the parts of a plant that are in the shade.
Answer the following in the space provided.
A. Describe phototropism using what you know about signal transduction. Start with auxin as a signaling molecule.
B. Explain how altering the receptor would affect the signaling pathway.
C. Predict how a plant would respond to exposure to light on all sides of a growing stem.
D. Provide reasoning and justification for your prediction.

Mendel based his conclusions on his understanding of meiosis.
a. FALSE
b. TRUE

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B. Antithyroglobulin antibody
C. Radioiodine uptake scan
D. Serum thyroglobulin level
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What is the purpose of the digestive system?

1. Create energy
2. Swallow food
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Which of the following statements about water is NOT true?
A. It helps to maintain a normal body temperature.
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C. It carries substances throughout the body in the bloodstream.
D. It is needed for all chemical reactions to occur.

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The female gametes are called__________. *

sperm
ova

Biology - Genetics
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Cuando se excita una neurona con estímulos de intensidad creciente se obtiene, a partir del umbral, la misma respuesta eléctrica. En esta situación se pone de manifiesto la característica de: *
A) ley del todo o nada.
B) período refractario relativo.
C) período refractario absoluto.
D) excitabilidad.
E) umbral de excitación.

The majority of a cell's life is in this phase.
A. centromere
B. interphase
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D. prophase

The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the
lithosphere, hydrosphere, and biosphere. Order the steps above into a logical sequence that might represent steps in
the phosphorus cycle.
A)
111, 111, IV, V, VI.
B)
1. II. IV. IIIVVI
C)
IV. HII VIIVI
D)
II IV V VI

If fertilization occurs which hormone triggers the thickening of the endometrium
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b.progesterone

1. In 1970, the U.S. Congress established The Environmental Protection Agency (EPA) to oversee all of the following, EXCEPT: *

A.pollution problems
B.building new nuclear power plants
C.establish new environmental policies
D.research solutions to environmental issues

Como se chama a transferencia de enrgia termica flui de um corpo com maior temperatura quando ao outro de menor temperatura quando ha diferença de temperatura entre ambos

A third-level consumer must be which type?
Carnivore
Herbivore
Producer
Decomposer