The vascular cambium
a. is part of a plant's secondary growth
b. produces secondary phloem and xylem tissue
c. increases in ring size each year
d. all of the above

The diagram illustrates the activity of vesicles during a cellular process.

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Which is a genetic engineering advancement directly related to a career in biotechnology? 1) improving solar energy collection 2) transporting textiles at higher rates 3)creating crop foods that resist insect pests 4)repairing historical sites with quality materials