Q: Q: Which theory explains how populations of organisms can change over time? Read this paragraph and choose the correct option from the provided answers: The theory of evolution by natural selection explains how populations of organisms can change over time. As environments change, so must the traits of organisms if they are to survive in the new conditions. Evolution by natural selection explains how this happens. It also explains why there are so many different species of organisms on Earth today. You can see examples of the incredible diversity of living animals in Figure below . You can read more about the theory of evolution in the chapter Evolution. Choices: - free by natural selection - changes by natural selection - intelligent selection - evolution by natural selection A:
A: evolution by natural selection

Q: Q: In police radar, a radar gun sends out short bursts of which waves? Read this paragraph and choose the correct option from the provided answers: Radar stands for ra dio d etection and r anging. In police radar, a radar gun sends out short bursts of microwaves. The microwaves reflect back from oncoming vehicles and are detected by a receiver in the radar gun. The frequency of the reflected waves is used to compute the speed of the vehicles. Radar is also used for tracking storms, detecting air traffic, and other purposes. Choices: - photons - soundwaves - electrodes - microwaves A:
A: microwaves

Q: Q: What parts of the planet does solar energy have difficulty reaching? Read this paragraph and choose the correct option from the provided answers: Much less solar energy gets to the poles. Choices: - oceans - deserts - equators - poles A:
A: poles

Q: Q: What is a prerequisite for fertilization to take place in plants? Read this paragraph and choose the correct option from the provided answers: Pollination must occur for fertilization to take place. Zygotes develop into embryos inside seeds, from which the next sporophyte generation grows. Choices: - mitosis - photosynthesis - germination - pollination A:
A: pollination