Natural Selection

Scientists measured the spine size of a population of cactuses found in an area in 1970. They measured the spine size of the cactus population again in 2015. Which of the statements below best describes the difference in the cactuses at the two time points?

• The cactuses in 1970 had smaller spines than the cactuses in 2015.

• The cactuses in 1970 had larger spines than the cactuses in 2015.

• There were more cactuses in 1970 than there were in 2015.

• There was more variation in spine size in 1970 than there was in 2015.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is natural selection?

• the process through which populations of living organisms adapt and change.

• Parents choose which genes their offspring have when each individual is born

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NGSS.MS-LS4-1

NGSS.MS-LS4-4

Why were the newts with the poison gene able to live longer than those newts without the poison gene?

• the newts with the poison gene were able to live longer than the other newts

• the newts with the poison live longer because they are able to reproduce more than the other newts

• both claims are correct

• neither claim is correct

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NGSS.MS-LS1-5

NGSS.MS-LS3-1

NGSS.MS-LS4-4

A new trait will only become more common in a population if it is _______________________________

• harmful to predators

• adaptive

• recessive

• dominant

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NGSS.MS-LS4-4

Which location has guppies (孔雀鱼) with medium spot size as the adaptive trait?

• Population in Brazil

• Population in Venezuela

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NGSS.MS-LS3-1

NGSS.MS-LS4-4

What changed in the environment to cause evolution?

• The water temperature increased.

• The water temperature decreased.

• The water temperature did not change.

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NGSS.MS-LS2-4

NGSS.MS-LS4-4

Which prediction supports the following statement? Red is the adaptive trait to survive predators.

• 
• 

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NGSS.MS-LS4-4

What change in the environment caused the evolution? 岩石越小，越适合斑点小的鱼生存。

• The amount of large riverbed rocks increased.

• The amount of small riverbed rocks increased.

• The amount of riverbed rocks did not change.

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NGSS.MS-LS2-4

NGSS.MS-LS4-4

What change in the environment caused the evolution?

• The tree bark became gray.

• The tree bark became black.

• The tree bark became black and gray.

• The tree bark became white.

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NGSS.MS-LS2-4

NGSS.MS-LS4-4

True or false? Thick beaks are the non-adaptive trait in the population.

• True

• False

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NGSS.MS-LS1-4

NGSS.MS-LS4-4