Newborn human babies with lesser body weight are prone to infections. heavier babies are difficult to deliver through the narrow pelvic passage of human mothers and may not survive. babies with normal body weight have a better chance of survival and can be delivered normally. what kind of selection is exhibited in this case?
a) stabilizing selection
b)directional selection
c)disruptive selection

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

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.