Biologist -c geologist -b chemist-d hydrologist-a
A.) A chromosome contains hundreds of genes, which are composed of DNA.
An ionic bond occurs between two oppositely charged ions, which means that it occurs between D. a positive and negative ion.
Answer:
Molecules of elements
Explanation:
An Element is formed of like one type of atoms. I am fairly sure an Element is a pure substance. xD please hit the heart ✓
The controlled group,( the experiment group is there to compare your results to the control group )