4.
enzymes in the human body work in a very wide range of conditions.

true

false
5.
a chemical reaction will change one substance into another by

dissolving a solute into solution

changing the nucleus of the atoms

breaking and forming chemical bonds

tightening the electrons inside atoms of elements

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.