Q: Scientists use the principles of what to make predictions, which they then test? Choices: - their teachers - their guesses - their faith - their hypothesis A:
their hypothesis

Q: What are the 2 primary hosts of ebola in central africa? Choices: - hyenas and apes - apes and hippos - lions and elephants - apes and bats A:
apes and bats

Q: Q: What is the matter through which sound waves travel? Choices: - dust - mass - air - medium A:
A: medium

Question: Q: Food chains and what describe the transfer of energy within an ecosystem, from one organism to another? Choices: - spider webs - fuel webs - the webs - food webs A:
Answer: food webs

*Question*
Q: What is the smallest class of elements? Choices: - halogens - noble gases - synthetics - metalloids A:
**Answer**
metalloids

Q: Some sea anemones establish what kind of relationship with hermit crabs by attaching to the crab's shell? Choices: - pathogenic - parasitic - predatory - mutualistic A:
mutualistic