Q: During a what type of reaction do chemical changes take place? Choices: - toxic - biological - nuclear - chemical A:
chemical

Q: Enzymes are a type of what, and as such, they are not reactants in the reactions they control? Choices: - hormone - metabolite - neurotransmitter - catalyst A:
catalyst

Q: Q: What does rearrangements of chromosomes contribute to the emergence of? Choices: - clones - extinction - fewer species - new species A:
A: new species

Question: Q: Which form of electromagnetic waves have more energy: low frequency wave or high frequency waves? Choices: - neither - low frequency waves - the same - high frequency waves A:
Answer: high frequency waves

*Question*
Q: On the ventral side of the embryonic disc, opposite the amnion, cells in the lower layer of the embryonic disk (the hypoblast) extend into the blastocyst cavity and form this? Choices: - embryo sac - neural sac - algae sac - yolk sac A:
**Answer**
yolk sac

Q: Q: The ostrich, kiwi, rhea, cassowary, and moa are examples of what kind of birds? Choices: - predators - raptors - prehistoric - flightless A:
A: flightless