The answer would be a.
Biological catalysts are generally proteins (and a group of RNA molecules called ribozymes), but carbohydrates do not play such a role.
Easy 5 points. Stop, Drop, and Roll. In that order.
Tsunamis can only occur in water.
Answer:
The need for continental time zones stemmed directly from the problems of moving passengers and freight over the thousands of miles of rail line that covered North America by the 1880s. Since human beings had first begun keeping track of time, they set their clocks to the local movement of the sun.
The Metamorphic Rock must undergo a process called Weathering and Erosion. Once it has become sediments it goes under another process called Cementing and Compacting. Now it has become a sedimentary rock.
