41:07 Knowledge of atomic structure has evolved over time. Thomson discovered that atoms contain electrons, Rutherford
discovered that most of the mass of an atom is concentrated in its center, and Bohr discovered that electrons orbit the
nucleus
Taken together, what do these discoveries demonstrate?
O the cumulative nature of science
O the quantitative nature of science
O the importance of thorough review of scientific papers
O the importance of not publishing science until it is final
Mark this and retum
Next
Submit

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas