All the organisms and the environment they live in form an ____. The ____ is made up of populations of different ____. Each population lives in a ____ within the ecosystem. Measuring population size by counting all the organisms in an area is often ____. However, you can ____ by taking samples using a ____. ____ can be used to estimate populations and the changes in ____ (non-living) factors. ____ can estimate population size of animals in a habitat.

Sampling

สั่งพิมพ์
ฝัง

ลีดเดอร์บอร์ด

สไตล์ภาพ

ตัวเลือก

สลับแม่แบบ

คืนค่าการบันทึกอัตโนมัติ: ใช่ไหม