Which of these is most likely to contribute to the long-term instability of a local ecosystem? a) storms that uproot large trees in the area b) introduction of a non-native animal species c) seasonal migration of birds to and from the ecosystem d) flash floods that destroy the nests of local water birds

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.