Ernest develops a about the structure of the atom, starting from the idea that all atoms are made from different numbers of two particles, a heavy positively-charged one and a light negatively-charged one. By using this idea Ernest is able to explain the results of many different experiments on atoms.

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

The reactions of photosynthesis occur in the of plant cell? a. mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll