Q: When salinity and pressure increase, or when temperature decreases, what happens to water density? Choices: - fluctuates - drops - stays the same - increases A:
increases

(Question)
Q: What do chemical reactions need to be activated? Choices: - food - space - products - energy A:
(Answer)
energy

Ques: Q: Which cycle tracks the flow of nitrogen through an ecosystem? Choices: - nitrogen reaction - water cycle - life cycle - nitrogen cycle A:
Ans: nitrogen cycle

(Q).
Q: The hardest natural substance, diamond is a form of what element? Choices: - zirconium - zenon - hydrogen - carbon A:
(A).
carbon

Ques:Q: The three layers of protective coverings of the spinal cord is called what? Choices: - dermis - tendons - muscles - meninges A:

Ans:meninges

Ques:Q: A machine is any device that makes work easier by doing what? Choices: - moving things - changing molecules - removing barriers - changing a force A:

Ans:
changing a force