Trilobites are found worldwide and evolved rapidly, making them easily distinguishable from trilobites of other time periods
1. For which of the following activities might you want to hire a chemist?A. testing a sample of water from a well
2. Which of the following procedures involves a physical change in one of the substances?
D. grinding chalk into a fine powder
3. You have three molecules of glucose (3C6H12O6). How many oxygen atoms do you have?
C. 6
Answer:
B. hydrogen bond
Explanation:
The double helix is held together by hydrogen bonds between the bases
