Answer the following question given this paragraph: The supertree also shows that another major diversification of mammals occurred about 50 million years ago. Again, worldwide climate change may have been one reason. This time Earth's temperature rose. The warmer temperature led to a greater diversity of plants. This would have meant more food for mammals or their prey. 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
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Answer the following question given this paragraph: Gymnosperms have seeds but do not have flowers. Q: Gymnosperms have seeds but do not have what? Choices: - leaves - stems - roots - flowers A:
flowers
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Answer the following question given this paragraph: Human cells have 23 pairs of chromosomes, and each chromosome within a pair is called a homologous chromosome . For each of the 23 chromosome pairs, you received one chromosome from your father and one chromosome from your mother. Alleles are alternate forms of genes found on chromosomes. Homologous chromosomes have the same genes, though they may have different alleles. So, though homologous chromosomes are very similar, they are not identical. The homologous chromosomes are separated when gametes are formed. Therefore, gametes have only 23 chromosomes, not 23 pairs. Q: How many pairs of chromosomes are found in human cells? Choices: - 25 - 24 - 13 - 23 A:
23
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Answer the following question given this paragraph: Amino acids connect together like beads on a necklace. MET, ASN, TRP, and GLN refer to four different amino acids. 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
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