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"Who Choose Them" Biological Diversity PPT
Part One: The Frog’s Departure and Residence
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, 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 extremely 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.
Who chose them PPT, part 2: Nature chose them
Can we speculate on the differences in the environments in which these three species of foxes live?
Three types of foxes live in different environments. What are the possible reasons?
When biologists compared individual organisms in different places, they discovered a very interesting phenomenon. That is, the colder the place, the larger the individual of the same organism, the closer the body is to a round shape, and the nose, ears, legs, etc. are exposed. The organs on the outside are smaller.
Does a round and large body like the Arctic fox really cool down slowly?
Let’s do a simulation experiment!
Choose 2 spherical flasks of different sizes, 1 slender and long glass bottle with a similar volume to the large flask, and 3 thermometers.
Fill 3 containers with hot water of the same temperature at the same time.
Use a thermometer to measure and observe which container's water temperature drops slowly.
Who chose them PPT, part 3: Choice changes living things
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 an important reason. Humans also played an important role in changing the living environment of organisms and domesticating some animals.
Crucian carp has been transformed into an ornamental goldfish through human cultivation and selection, and obvious changes have been found in its physical characteristics.
Collect information on how natural selection or artificial selection changes biological characteristics and communicate with the class.
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