What polysaccharide provide the strength to insect exoskeletons?
a. cellulose
b. chitin (my answer)
c. starch
d. glycogen

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel

The carrier molecules of the electron transport system are located in the