What characteristic does giardia have that makes it a protist, a characteristic that all other protists have? a. it is a unicellular eukaryote. b. it is a eukaryote that is not an animal, a plant, or a fungus. c. it is parasitic and has flagella. d. it spends part of its time in a body of water.

The correct answer is option B, that is, it is a eukaryote that is not an animal, a plant, or a fungus.  

Giardia refers to a microscopic parasite (a protist), which leads to a diarrheal disease called giardiasis. It is found in food, soil, or water, or on the surfaces, which has been contaminated with feces from infected animals or humans.  

The protists are the eukaryotes, that is, their cells possess a nucleus and other membrane-bound organelles. The majority of the protists are unicellular. Other than these characteristics, the protists are considered as all the eukaryotic species, which are neither plants, animals, nor fungi.  

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.