Q: In their pure form, all elements have an oxidation number of what? Choices: - 3 - 2 - 7 - zero A:
zero

Q: What is the term used for the ability of salamanders to grow back lost limbs and other body parts? Choices: - extraction - transformation - expansion - regeneration A:
regeneration

Q: Q: What kind of succession occurs in an area that has never before been colonized? Choices: - addition succession - secondary succession - support succession - primary succession A:
A: primary succession

Question: Q: Which vitamin is made in the skin when it is exposed to sunlight? Choices: - Vitamin C - Vitamin B1 - Riboflavin - vitamin d A:
Answer: vitamin d

*Question*
Q: What system of the body can specifically protect you from pathogens and other things that might make you ill? Choices: - muscle - cardiovascular - digestion - immune A:
**Answer**
immune

Q: What type of tissue runs the length of a stem in vascular bundles? Choices: - thermal tissue - muscle tissue - cardiac tissue - vascular tissue A:
vascular tissue