Ques: Q: What cannot be created or destroyed in a chemical reaction? Choices: - heat - mass - energy - matter A:
Ans: matter

Ques: Q: Wings of bats and birds serve the same function. which body part should you study to understand ancestral differences? Choices: - skull size - skin and feathers - skin inside wings - bones inside wings A:
Ans: bones inside wings

Ques: Q: Which organ has a thick mucus lining that protects the underlying tissue from the action of the digestive juices? Choices: - liver - colon - spleen - stomach A:
Ans: stomach

Ques: Q: What is the heart's main task? Choices: - make blood - clean blood - split blood cells - pump blood A:
Ans:
pump blood