Which exhibits a learned behavior? a) baby birds beg for food when a parent nears. b) salmon return to their birth place for mating. c) a person blinks when a baseball is thrown at their face. d) a dog runs to his dish when his owner opens the back door.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

what bodys are there orbiting?