The complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?
a. carbon can form four strong covalent bonds.
b. carbon can only form one bond at a time.
c. carbon forms ionic bonds with most elements.
d. carbon is the lightest and smallest element.

Analyze the impact of the availability of health services in the community and the world. research various school and community health services for people of all ages such as vision and hearing screenings and immunization programs. identify situations requiring professional health services for people of all ages such as primary, preventive, and emergency care.