Answer:
Its B-Contaminated hope this helped in any way!!! have a nice day!!
Explanation:
Primary consumers only eat primary producers such as herbivores and secondary consumers are carnivores and omnivores
Answer:
<u>A common element among all the river valley civilizations was irrigation systems that moved water to crops and settlements</u>
Explanation:
- <u>River Valley civilizations where the civilizations that were found on the banks of the river like the Mesopotamia ,Indus valley civilization.</u>
- <u>These civilization where agriculture based civilization as they depended on river for drinking water and irrigational activities</u>
