You are talking with a classmate about modeling electromagnetic waves. You suggest using a spring toy, such as the one in Lesson 1. Your classmate says springs only have compression waves, so your model won't work. Is your classmate correct?

Enzymes affect the reactions in living cells by changing the

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.

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two