The sentence, "People who take more vitamins are less likely to get sick." is an example of a(n) controlled variable

hypothesis

problem

observation

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

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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:

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.