The diagram below shows how a chemical message produced by one cell is received by other cells If these chemical messages are destroyed, the target cells will

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

In what part of the body does the most muscle activity happen?

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.