What holds the two strands of DNA molecules to each other. Hydrogen Bonds
I only know 2 and 3 are correct. I’m not sure about the last one.
They use tools to help take precise measurements, carry out experiments, and make observations.
Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment and are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.
Hope this helps :))
