why do identical twins have the same physical characteristics , whereas regular siblings are not identical

How much energy is made when a pice of wood burns. how do you know

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

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.