For the first time in five years california authorities have issued a first stage smog alert, warning people in some areas of unhealthy levels of ozone in the air. smog contains several dangerous chemical compounds beside ozone: sulfur dioxide, nitrogen dioxide, and carbon monoxide. since it would be impossible to wear gas masks like those in the picture, a reasonable plan would be to

Which of the following is an example of an environmental change the affected the evolution of life a. volcanic activity b. changes in climate c. mountain building d. all of the above

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.

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?