Answer:
vxcvggccbbcCbnmhxx vgfscvjjg
A. a mixture is a combination of two or more substances in which each substance retains its own properties.
Plant: leaf tissue
Human: lungs
A control group is the group in an experiment that does not receive any sort of change, to then be compared to the other treated objects at the end of the study.
Answer:
nitrogen dioxide
Explanation:
this was on my chemistry test
