Alaboratory investigation included examining prepared slides of pond water. single-celled organisms with a nucleus and either cilia or flagella were visible. these organisms probably belong to the kingdom

Protista

Explanation:

The kingdom Protista includes single celled eukaryotic organisms. They posses nucleus and other organelles like other eukaryotic organisms. They are simple organisms that live in water, moist or terrestrial habitats. They are either parasitic or may live in symbiotic association with other organisms. They posses cilia and flagella which facilitates their movement.

On the basis of the above description, this can be said that the observed organism will belong to kingdom Protista.

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explanation:

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: