Why is the chemical path nitrogen follows in living systems referred to as a cycle? A) Nitrogen is used and reused.

B) Nitrogen is only used once and destroyed.

C) Circular cells are used to propel the nitrogen along the pathway.

D) The pathway is shaped like a circle.

What is the percentage of hydrogen in c2h4

Once similarity and one difference between a mixture of elements and a mixture of compounds

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.