Both euglena (a eukaryote) and cyanobacteria are photosynthetic unicellular organisms found in pond water. the feature that distinguishes euglena from cyanobacteria is the
a
presence of a nucleus
b
ability to reproduce
c
presence of a cell membrane
d
ability to maintain homeostasis
e
presence of ribosomes

The presence of the nucleus!

Explanation:

Since it is a Bacteria, they do not have a nuclei. But eukaryotes do.

Both can reproduce(tip: Bacteria is asexual meaning it can reproduce by itself), has a membrane and have ribosomes

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.