Invertebrates are sometimes referred to as "lower" animals. this is because they evolved earlier and are simpler than vertebrates. do you think invertebrates are also less adapted to their environments that vertebrates? why or why not?

During convection, less dense fluid rises and denser fluid sinks.

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.

Agram of fat oxidized by cellular respiration produces approximately as much atp as a gram of carbohydrate.