Why a female may have two periods in one month?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

According to this food web which of the following would be considered primary consumers

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.