Rocks containing 450-million-year-old Ordovician fossils contain jawless fish. Younger Devonian rocks that are only 400-million-years-old contain fossils of jawless fish and fish with jaws. What idea does this evidence support?

Mga halaman/punong ornamental na di namumulaklak

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom