Due to the coronavirus pandemic, more scientists have taken to testing the effectiveness of different masks. Recently, conflicting studies on the effectiveness have neck gaiters have been published, causing many medical experts to call for even more research and cautioning people against exclusively using them. What characteristic(s) of science does this demonstrate? Group of answer choices Science is observable All of the above Science is flexible Science is testable

The answer to your question is All of the above

Explanation:

Science is observable, testable, and flexible. This is shown when doing an experiment. First you observe something, test, then record. When new information or evidence comes in, Science is flexible enough to allow changes to the topic's existing evidence or add on to it.

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: