Which is the correct symbol for the element silicon?

A. SI
B. S
C. Si
D. Sil

Place the steps tor the formation of the enzyme pepsinogen in correct order

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste. the percentage of food that the united states wastes each year is %.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above