Question

what evidence does embryology provide for common descent? (dok 2)
embryology shows that embryos of different species have similar developmental stages, suggesting common ancestry.
embryology focuses on the behavior of organisms in their ecosystems.
embryology only studies adult organisms that have reached their full size.
embryology proves that all species have identical embryos until they reach 4 weeks of gestation

how do protein sequence comparisons support the theory that all living organisms are related? (dok 2)
protein sequence comparisons only show differences in diet, indicating evolutionary relationships.
protein sequence comparisons are used to measure body size, indicating evolutionary relationships.
protein sequence comparisons determine the age of fossils, indicating evolutionary relationships.
protein sequence comparisons reveal similarities in amino acid sequences, indicating evolutionary relationships.

Explanation:

For the first question:

• Embryology is the study of embryos. Similar developmental stages in different species' embryos suggest a common ancestor.
• The second option is about behavior in ecosystems (ecology, not embryology).
• The third option is wrong as embryology studies embryos, not adult organisms.
• The fourth option is incorrect as embryos are not identical across all species.

For the second question:

• Protein sequence comparisons look at amino - acid sequences. Similarities in these sequences (as proteins are coded by genes) indicate evolutionary relationships (common ancestry).
• The first option about diet differences is not related to protein sequence comparisons for evolutionary relationships.
• The second option about body size measurement is not the function of protein sequence comparisons for evolutionary evidence.
• The third option about determining fossil age is done by radiometric dating etc., not protein sequence comparisons.

Answer:

1. Embryology shows that embryos of different species have similar developmental stages, suggesting common ancestry.
2. Protein sequence comparisons reveal similarities in amino acid sequences, indicating evolutionary relationships.