For many generations, the following genotypic frequencies were observed in a large population of dinosaurs: 4 percent aa, 32 percent aa, and 64 percent aa. the climate changed abruptly and resulted in the death of all homozygous recessive dinosaurs (s = 1). in the next generation, the recessive homozygotes died shortly after birth. what percentage of these newborn dinosaurs died? show calculation
a) 4% b) 8.5% c) 19.7% d) 36.8% e) 44%

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.