Name the two main groups of solids.

Name the two major groups of bryophytes.

Name the two main parts of a stamen.

Name the main ores of lanthanoids?

Name the main ore of iron.

Write the two main functions of cuboidal epithelium.

What is a semiconductor? Describe the two main types of semiconductors and contrast their conduction mechanism.

Name the two basic phases of cells cycle and differentiate between the two.

Name two amino sugars.

Name the two parts of a stamen.