Answer:
hepatitis A is the only one
Soil is a mixture of weathered rock and organic material.
Is when you breathe in oxygen and exhale carbon dioxide
Answer:B is the right answer I am sure.
Explanation:
To test the effectiveness...
A. This variable should be controlled (the same in both groups).
B. The new chemical is what is being added to the experimental group.
C. This is the control group to which the treated couch should be compared.
D. This is the experimental group to which data should be taken.
Final answer: D
