Q: What do you call a period when temperatures are cooler than normal, causing glaciers to spread? Choices: - polar age - earth age - thermal age - ice age A:
ice age

Q: What amazing machines smash particles that are smaller than atoms into each other head-on? Choices: - nitrogen accelerators - observant accelerators - absorption accelerators - particle accelerators A:
particle accelerators

Q: Crossover occurs between non-sister chromatids of which chromosomes? Choices: - analogous - identical chromosomes - compound chromosomes - homologous A:
homologous