When darwin compared a glyptodont fossil to a living armadillo what did he conclude
a. species vary globally
b. species vary locally
c. species vary over time
d. species vary when isolated

you have found the fossil of an ancient, extinct species , you compare it to a modern living species that is closely related. which of the following could you reasonably expect to observe?
a. the fossil and the living species will have identical features
b. the fossil and the living species will have some similarities and some differences
c. the fossil and the living species will differ only

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.