Q: What do scientist's believe mercury's core is mostly made of? Choices: - water - quicksilver - helium gas - melted iron A:
melted iron

Q: Shivering and adipose tissue called brown fat are used by mammals in particular to produce what? Choices: - energy - blood - nutrition - heat A:
heat

Q: Q: What kind of water are cattails adapted for with narrow, strap-like leaves? Choices: - stagnant water - saline water - turbulent water - moving water A:
A: moving water

Question: Q: What does hemoglobin in blood carry to the cells? Choices: - methane - carbon dioxide - nitrogen - oxygen A:
Answer: oxygen

*Question*
Q: How many limbs to birds have? Choices: - five - six - ten - four A:
**Answer**
four

Q: Q: Balanced chemical reactions are balanced in what? Choices: - atoms - molecular bonds - electrical charge - terms of moles A:
A: terms of moles