Q: The mechanical advantage of a machine is related to how it changes what? Choices: - pressure - nature - example - force A:
force

Q: What are substances that provide hydrogen ions (h+) and lower ph? Choices: - proteins - nutrients - bases - acids A:
acids

Q: Q: Where are most plants firmly rooted? Choices: - rock - grass - mineral - soil A:
A: soil

Question: Q: Neutron stars are the corpses of left over what? Choices: - planet explosions - gravitational explosions - stellar explosions - supernova explosions A:
Answer: supernova explosions

*Question*
Q: What is the term for a theoretical framework for describing evolutionary change in populations through the change in allele frequencies? Choices: - percent genetics - density genetics - total genetics - population genetics A:
**Answer**
population genetics

(Question)
Q: What members of an ecosystem food chain take in food by eating producers or other living things? Choices: - primary producers - decomposers - insectivores - consumers A:
(Answer)
consumers