Q: Dutch elm trees used to be common, beautiful trees in the united states. now most of them have been killed by what? Choices: - carbon dioxide - beetles - cancer - dutch elm disease A:
dutch elm disease

(Question)
Q: Which property changes when a glass breaks? Choices: - State - Chemical - density - its physical property A:
(Answer)
its physical property

Ques: Q: A lewis acid is a substance that accepts a pair of electrons to form what? Choices: - accretion bond - functionality bond - ambivalent bond - covalent bond A:
Ans: covalent bond

(Q).
Q: The arid environment of a desert, for instance, can quickly deplete an animal of what? Choices: - strength - protein - air - water A:
(A).
water

Ques:Q: What type of forces are involved when deposited rock forms deltas or barrier islands? Choices: - gravity forces - accumulation forces - matter forces - constructive forces A:

Ans:constructive forces

Question: Q: What is the method of evolution by which advantageous heritable traits become more common over generations? Choices: - artificial selection - same selection - flow selection - natural selection A:
Answer:
natural selection