Q: Chemical reactions either require or release what? Choices: - light - electricity - enzymes - energy A:
energy

(Question)
Q: What is the cutting and burning trees to clear land for farming called? Choices: - drop-and-blaze agriculture - cut-and-smoke farming - reduce-and-ignite agriculture - slash-and-burn agriculture A:
(Answer)
slash-and-burn agriculture

Ques: Q: Who created the periodic table? Choices: - Isaac Newton - Gregor Mendel - Niels Bohr - dmitri mendeleev A:
Ans: dmitri mendeleev

(Q).
Q: In science, what process produces evidence that helps answer questions and solve problems? Choices: - information - manipulation - suspension - investigation A:
(A).
investigation

Ques:Q: Enzymes - proteins which speed up what? Choices: - crystals reactions - liquid reactions - physical reactions - chemical reactions A:

Ans:chemical reactions

Ques:Q: What is a pure substance that cannot be separated into any other substances called? Choices: - light - Cells - Spears - element A:

Ans:
element