تحميل مذكرة ساينس رائعة كاملة للصف الرابع الابتدائى نظام حديث2022

Fourth primary Science

Adaptation and survival

Some problems face the survival of living organisms in different habitats:
1. Increasing or decreasing of temperature.
2. Shortage or plenty of water.
3. Food availability.
4. Shelter.

Adaptation
It is a way that helps the living organism to adapt and survive in its environment.
Bats
1. Most bats eat insects, as: mosquitoes.
2. Bats act as bees and butterflies in helping plants and flowers.
3. Bats hang (sleep) upside down.
4. Although bats aren't birds, they can fly.

Echolocation
It is a way that some animals use to find the location of things.

- Bats hunt for food in total darkness.
- Echolocation is important for them to survive.
- Bat produces sound.
- This sound travels through the air until it hits a surface.
- Then, it returns back to the bats' ears, causing them to hear

Life applications on Echolocation:
Vibrating walking stick inspired by bats

Main idea:
- It produces very high sound like bats that can't be heared by the man's ears.
How it works?
- The blind people use the vibrating walking stick during walking.
- The stick receives the echo.
- Then, the stick changes this echo into vibrations.
- The blind people feel these vibrations with their thumb.
- The vibration buttons can tell the human the direction of the objects and how for the object is from the person.

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تحميل مذكرة أحياء لغات biolody اولى ثانوى شرح و أسئلة منهج جديد2021
شرح و مراجعة Third preparatory sciences
مراجعة نهائية و امتحانات علوم للمرحلة الاعدادية
مذكرة ساينس (science) للصف الخامس الابتدائى رائعة جدا 5th grade sciences