Homologous structures are structures found in one species that have the same basic anatomical structure and embryonic origin as those found in another species. If homologous structures are found on organisms of two different species, the species are related, even if only distantly. Which of the following structures are homologous and illustrate evidence of an evolutionary relationship?
A.
a bird's wing and a butterfly's wing
B.
a wasp's wing and a dolphin's flipper
C.
a catfish's fin and a bee's antenna
D.
a whale's flipper and a cat's leg

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.