"Animal Reproductive Activities" New Life PPT

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Fourth Grade Science Volume 2, Textbook Edition	pptx	6 MB

"Animal Reproductive Activities" New Life PPT

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Upload Time: 2024-09-30

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"Animal Reproductive Activities" New Life PPT

Part I: Reproductive activities of oviparous animals

Many animals reproduce by laying eggs. Many of the activities of animals are in preparation for reproduction.

The stamens of plants are divided into stamens and pistils. The pollen produced by the stamens travels to the stigma of the pistil, fertilizing the ovules in the ovary. The fertilized ovule develops into a seed.

Animals are similar. Many animals are divided into males and females. Eggs laid by female animals can develop into new life only after they are combined with the sperm of male animals.

Animal reproduction activities PPT, part 2: how they are born

Some animals do not lay eggs, such as cats, dogs, rabbits, etc. How do they reproduce and produce new lives?

The fertilized eggs of animals are not excreted from the body. They stay in the mother's body to absorb the nutrients provided by the mother's body, grow and develop. After a period of time, they gestate into larvae and are then produced from the mother's body.

The way cats, dogs, rabbits, etc. reproduce their offspring is called viviparous. Animals that reproduce by giving birth are called viviparous animals.

Viviparous animals generally use lactation to feed their young. Recall the scenes of animals lactating that we have seen.

Keywords: Free download of Chinese PPT courseware for the second volume of the fourth grade of the textbook version, download of animal reproductive activities PPT, download of new life PPT, .PPT format;

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"Animal Reproduction Activities" New Life PPT Download:

"Reproductive Activities of Animals" New Life PPT Download Part One Content: New Knowledge Explanation 1. Reproductive Activities of Oviparous Animals Courtship, Mating, Building Nests, Laying Eggs, Hatching, and Brooding Many activities of animals are to prepare for reproduction. Courtship, mating, building nests, laying eggs, hatching, and brooding. two,..

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"Animal Eggs" New Life PPT Part One: Animal Eggs Collect eggs of various animals and observe their similarities and differences. Butterfly eggs Frog eggs Toad eggs Fish eggs Eggs of various birds Use a magnifying glass to observe the outside of the egg, we will find...

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Update Time: 2024-09-30

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"Animal Reproductive Activities" New Life PPT