Limb bones within unrelated animals that have the same basic structures are considered
a. vestigial structures.
b. analogous structures.
c. homologous structures.
d. embryological.

Select the correct answer from each drop-down menu. during the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

Explain how scientists use geologic time to determine the age of landforms.

What is the key to the recognition of codominance?