Scientists use computer models to study complicated events and to a. perform experiments
b. state theories
c. change theories and laws
d. make predictions

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

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.

The effect of a hormone on a target cell may be decreased by the presence of