Under a microscope, a series of cells are observed that lack membrane-bound internal organelles. which of these is the most likely cell type?

The series of cells observed which lack membrane-bound internal organelle are called prokaryotes type of cells.

Prokaryotic organisms such as bacteria don’t have internal membrane, or don’t have nucleus which makes it different from eukaryotic organisms such as human beings. 

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.

the areas around the equator