Metabolism refers to the chemical reactions needed to convert food into energy. What must occur before this energy can be used?
a. Food must be digested and combined with carbon dioxide
b. Food must be digested and combined with oxygen
C. Food must be eliminated from the body
d. None of the above

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.

Isotopes of the same element have differ in their