Answer:

amoeba

Answer	Crossword Clue
AMOEBA	Single-celled critter
AMOEBA	One-celled organism
AMOEBA	Simple organism

AMOEBA	Protozoan
AMOEBA	Blobby protozoan
AMOEBA	Microscopic animal
AMOEBA	Pseudopod flexer
AMOEBA	Simple life?
AMOEBA	Organism with pseudopods
AMOEBA	Organism that reproduces by fission
AMOEBA	Organism once called a Proteus animalcule

AMOEBA	School lab subject
AMOEBA	Biology 101 protozoan
AMOEBA	Bio lab subject
AMOEBA	Creature that divides to multiply
AMOEBA	Lab slide critter
AMOEBA	One-celled protozoan
AMOEBA	Slide specimen
AMOEBA	It divides to multiply

AMOEBA	Lab subject
AMOEBA	Protozoa genus
AMOEBA	Microscope organism
AMOEBA	Single-celled organism
AMOEBA	Slide show participant?
AMOEBA	Biology class sighting
AMOEBA	Critter that multiplies by dividing
AMOEBA	Marine monad

AMOEBA	Microscopic organism
AMOEBA	One-celled being
AMOEBA	One-celled creature
AMOEBA	Slide subject
AMOEBA	Tiny protozoan
AMOEBA	One-celled protozoa
AMOEBA	Microscopic swimmer
AMOEBA	Biology class subject

AMOEBA	Blobby being
AMOEBA	Microscopic mover
AMOEBA	Slide presentation?
AMOEBA	Low life
AMOEBA	Shapeless organism