The correct answer is: B. the lysosomes.
Lysosomes are single-membrane organelles found in eukaryotic cells. Lysosomes are specialized vesicles created in the rough endoplasmic reticulum (rER) with a variety of enzymes inside it. Their function is digestion: of the food or of the cell when it dies and that function is performed via enzymes.
Observation is a factual statement that cannot be changed or replaced.
Explanation)
Hypothesis is a tentative statement that can be tested.
Scientific law and theory are considered a fact but can be disproven if new evidence emerges.
The neuron, or the impulse-conducting cell of nervous tissue.
Swamp ... Hope this helps :)