Answer:
hydrogen
Explanation:
Honestly, I don't know why DNA is held by hydrogen bonds, but I know that's the answer to your question.
Hope this helps :)
The host is the host and the guard cell is the guard
Answer:
It has 2 significant figures
Scientists classify organisms to make them easier to study. Taxonomy is very useful to scientists because once an organism is classified they can already learn about it
Chronic hepatitis is usually caused by contaminated needles due to drug use or sexually transmitted disease. Acute hepatitis is usually caused by the hepatitis A infection due to poor living conditions.
