The third one, hope this helped.
Answer is D:) Just took the test
Answer:yes
Explanation:
Impure substance is a mixture of 2 or more molecules
If you mean periodic table then it would be atomic number
Answer:
DNA
Explanation:
Deoxyribonucleic acid or DNA is defined as the genetic material in all the living organisms responsible for all the genetic activities in an organism.
DNA carries genetic instructions that are inherited from one generation to another generation. The DNA comprises of genes having specific genetic code that encodes the sequence of amino acid residues in proteins. DNA undergoes the process of replication and form several copies of it which are passed on to next generation.
Hence, the correct answer is "DNA".