Q: A major diversification of what animal group occurred about 50 million years ago, possibly spurred by worldwide climate change? Choices: - reptiles - amphibians - insects - mammals A:
mammals
------
Q: Gymnosperms have seeds but do not have what? Choices: - leaves - stems - roots - flowers A:
flowers
------
Q: How many pairs of chromosomes are found in human cells? Choices: - 25 - 24 - 13 - 23 A:
23
------
Q: Met, asn, trp, and gln connect together like beads on a necklace and are an example of what type of acids? Choices: - polymer acids - organism acids - peptic acids - amino acids A:
amino acids
------