Only one acidic because litmus turns blue in bases :D
The statistical study of all populations is called demography
Answer:
The law of conservation of mass states no matter is created or destroyed. This means that the matter currently on Earth is the only matter that will ever be available to us. However, it also means that this matter will not be destroyed. So, water, oxygen, carbon, and nitrogen are all used by living things in our world and then recycled to be used again.
One example of this is the water cycle. More water is never added or taken from the world, it is just reused. First, water starts in some body of water and then evaporates into the air. Then, the water falls back to Earth as precipitation.
Answer:
Hey, I would love to help you with this question
Explanation:
Just wondering if there is a picture that goes with the question?
If there is please make another question with a picture of it and I will answer!
If not I will answer in he comments!
:)
My best answer would be A) Cnidarians
