People's Education Edition Biology for Grade 8, Volume 1
People's Education Edition Biology for Grade 8, Volume 2
People's Education Edition seventh grade biology volume 1
People's Education Press High School Biology Compulsory Course 2
Beijing Normal University Edition Seventh Grade Biology Volume 2
People's Education Press seventh grade biology book volume 2
Beijing Normal University Edition Eighth Grade Biology Volume 1
Beijing Normal University Edition Seventh Grade Biology Volume 1
Beijing Normal University Edition Eighth Grade Biology Volume 2
High School Biology Compulsory Course 1, published by People's Education Press
Jiangsu Education Edition Seventh Grade Biology Volume 1
Jiangsu Education Edition 8th Grade Biology Volume 1
Jiangsu Education Edition Seventh Grade Biology Volume 2
Jiangsu Education Edition 8th Grade Biology Volume 2
Category | Format | Size |
---|---|---|
People's Education Edition Biology for Grade 8, Volume 1 | pptx | 6 MB |
Description
"Mammals" Main groups of animals PPT courseware 4
1. Main characteristics of mammals
1. Except for a few aquatic species such as whales, which have degraded body hair, all mammals are covered with hair.
Body hair has a very good thermal insulation effect, and mammals are warm-blooded animals.
2. Viviparous birth and lactation - improve the survival rate of offspring
Viviparous: The embryos of most mammals develop in the female body, obtain nutrients from the mother's body through the placenta, and are produced from the mother's body after development to a certain stage.
Lactation: Females use their own milk to feed their offspring so that they can grow up under superior nutritional conditions.
Main characteristics of mammals
(1) Hair on body surface;
(2) Viviparous, lactation;
(3) Teeth are differentiated into incisors, canines and molars.
2. The relationship between mammals and human life
Penguin is a flightless bird
The platypus is a mammal, but its eggs are laid by its mother and hatched by the temperature of the mother's body like birds. The mother has no breasts and nipples, and secretes milk on both sides of the abdomen. The cubs lie on the mother's abdomen to lick food.
Keywords: teaching courseware for the main groups of animals, teaching courseware for mammals, download PPT courseware for the first volume of eighth-grade biology from the People's Education Edition, download courseware for eighth-grade biology slides, download PPT courseware for the main groups of animals, download PPT courseware for mammals, .PPT Format;
For more information about the "Main Groups of Animals Mammals" PPT courseware, please click the "Main Groups of Animals ppt Mammals ppt" tag.
"Mammals" Main groups of animals PPT courseware 6:
"Mammals" Main Groups of Animals PPT Courseware 6 External Form of Rabbit The body is divided into five parts: head, neck, trunk, limbs and tail. The body is covered with hair. Coarse hair: rare, resistant to friction and plays a protective role. Villi: fine, covering the skin and playing a thermal insulation role. Heart...
"Mammals" Main groups of animals PPT courseware 5:
"Mammals" Main Groups of Animals PPT Courseware 5 Learning Objectives 1. What are the main characteristics of mammals? (Key and difficult) 2. What is the relationship between mammals and human life? Task: Read the main characteristics of mammals and complete the following questions (page 3637)..
"Mammals" Main groups of animals PPT courseware 3:
"Mammals" Main groups of animals PPT courseware 3 Think about it and discuss it Mammals feed their young with milk, and small animals will suck milk as soon as they are born. I would like to ask: What are the advantages of breastfeeding? By studying this section, you will know: 1. The main characteristics of mammals...
File Info
Update Time: 2024-10-04
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