S7L1

Why are there fewer kinds of organisms at each lower level of classification?

• The higher the level of classification, the more closely related the organisms become.

• The lower the level of classification is, the more complex the organism becomes

• The higher the level of classification is, the smaller the size of the organism.

• The lower the level of classification, the more closely related the organisms become.

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NGSS.MS-LS4-2

The earliest classification system was developed by Aristotle in the 4^th century B.C. This system classified all living things as either plants or animals. The two-kingdom system remained in place until 1866, when the kingdom Protista was created. What new information most likely led scientists to revise the existing classification system?

• the magnifying glass showed scientists that plants were made up of cells

• the microscope enabled scientists to discover single-celled organisms

• the microscope showed that cells of plants and animals have different structures

• the telescope enabled scientists to see objects they could not view before

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NGSS.MS-LS4-2

The illustration below shows a single-celled organism that has a nucleus and organelles, lacks a cell wall, and obtains food by eating other organisms. The organism also has cili that it uses to move through water. Into which kingdom would this organism be classified?

• Animal

• Eubacteria

• Plant

• Protist

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NGSS.MS-LS1-1

All animals fit into different levels of classification. The illustration below shows several of these classification levels. Which number on the illustration represents the species level?

• 1

• 2

• 3

• 4

List the steps of the scientific method

d

e

f

c

b

a

Analyze results

Ask a question

Communicate results

Conduct experiment

Form a hypothesis

Draw conclusions

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NGSS.HS-LS1-3

NGSS.HS-PS1-3

NGSS.HS-PS3-4

Organisms are classified according to shared characteristics. This process has led to the development of a classification system that has various levels of organization. Which of the following levels of classification is of the lowest hierarchy?

• kingdom

• class

• species

• domain

In the 1700s, Carolus Linnaeus tried to classify all living things. He developed a seven-level system of classification, which is still used today. Linnaeus grouped lower levels into successively higher levels, based on shared characteristics. What group is made up of different species?

• family

• class

• genus

• species

The Linnaean system of classification groups organisms into levels based upon shared characteristics. Which statement about the hierarchy of classification is incorrect?

• The species level represents the smallest level of classification.

• Each kingdom can be divided into different phylum.

• A genus cannot contain members of a different species.

• Organisms can belong to the same class, but different orders

This illustration above shows a system that Shelby developed to classify different animals. Based on the information provided, which of the following best describes how Shelby placed the animals into each category?

• according to their structural features

• according to their genetic similarities

• according to their behavioral features

• according to the locations of their habitats

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NGSS.MS-LS4-2

Rather than using common names, scientists use binomial nomenclature when classifying organisms. Which is the correct way to write the binomial nomenclature of dogs?

• Canis familiaris

• canis familiaris

• Canis Familiaris

• Canis familiaris