Using a Punnett square, predict the percentage of the F2 generation that would have both recessive traits (rryy) in a dihybrid cross that starts with F1 generation parents with the genotype RrYy. A. 18.75%
B. 37.5%
C. 6.25&
D. 50%

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.