Why did scientists originally think that man could not synthesize organic compounds

6/12=1/2

step-by-step explanation:

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it