"Who Choose Them" Biological Diversity PPT Courseware 2

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"Who Choose Them" Biological Diversity PPT Courseware 2

Just like a mother cat and a father cat give birth to kittens of different colors, so do the offspring of frogs.

In the fields, green frogs are retained because of their good camouflage, while frogs of other colors are too conspicuous and are eaten by predators.

The environment changes, green grass dies, and fields turn into deserts. Green frogs are very conspicuous on the yellow sand and are easily spotted by predators. In this way, the yellow frogs will be retained in future generations, and the frogs here will become mainly yellow frogs in the future.

Observe the foxes living in different environments in the picture. What are their different characteristics? Can we speculate on the differences in the environments in which these three species of foxes live?

Gray Fox:

Body length: about 50~80 cm;

Weight: about 2~3 kg;

Main activity range: forests, swamps. Good at climbing trees and jumping freely between branches.

Red fox: aliases include: fire fox, red fox, etc.

Red fox is the most common fox, with a slender body and tail glands.

Body length: about 80 cm;

Weight: 4~6.5kg;

Living range: Very wide, mainly found in the wilderness deserts of North America.

Arctic fox: body length 50~60 cm, tail length 20~25 cm, weight 2500~4000 grams. Obesity. The mouth is short, the ears are short and slightly rounded.

Choices change creatures:

From the appearance of simple life forms on the earth 3.8 billion years ago to the rich and colorful life world today, changes in the earth's environment are always the main reason. Humans also played an important role in changing the living environment of organisms and domesticating some animals.

How do animals raised in captivity compare to their wild counterparts?

No more protection from coat color

Larger body shape, in line with human needs

Wild boars turned into domestic pigs, and rice turned into hybrid rice. This is the result of __________.

Natural selection and artificial selection change organisms and create their __________.

Thinking: Was the giraffe’s neck originally this long? Who chose it?

result of natural selection

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For more information about the PPT courseware "The Diversity of Biology Who Chooses Them", please click the Diversity of Biology ppt Who Chooses Them ppt tag.

"Who Choose Them" Biodiversity PPT teaching courseware:

"Who Choose Them" PPT Teaching Courseware on Biological Diversity Part One: Introduction of New Lesson The dinosaur family that once dominated the earth has perished, but the little mantis of the same era still lives on the earth. What determines the fate of life on earth? ..

"Who Choose Them" Biological Diversity PPT Download:

"Who Choose Them" Biological Diversity PPT Download Part One: New Course Lecture: The Departure and Stay of Frogs What kind of environment might they live in? Just like a mother cat and a father cat give birth to kittens of different colors, the offspring of frogs also have different colors...

"Who Choose Them" Biological Diversity PPT:

"Who Choose Them" Biological Diversity PPT Part One: The Go and Stay of Frogs Observe two frogs, what kind of environment might they live in? Just like a mother cat and a father cat give birth to kittens of different colors, the offspring of frogs also have different colors...

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Update Time: 2024-10-19

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 1 industry PPT template

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