Do cactus leaves have air spaces?

As the spies of a cactus are modified leaves, they have ar spaces.

Explanation:

However, leaves of cactus are not like every other leaf. These leaves are in the form of spines to save the amount of water that the cactus needs.

Most of the amount of water, cactus s saving in its root. Also, the stem of a cactus is used for making food, and this is also the way of saving the water.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.