Which best describes the current model of the atom?

a-it is similar to the model of the solar system with orbiting planets.
b-it has remained the same for several centuries.
c- it is similar to the model of plum pudding with suspended plums.
d- it may be revised with increasing scientific knowledge.

The answer is : D. it may be revised with increasing scientific knowledge.

Explanation: Not only did I take the test, but the current model of the atom isn't similar to the model of the solar system whatsoever. Nor has it stayed the same for centuries. In fact, all of it's revision occurred in the 20th century, not several of centuries. It changed multiple times. Aside from that, the model isn't similar to the model of plum pudding. Therefore, the reasonable answer is D. The model of the atom has changed over time and will continue to do so if more is discovered.

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:

the answer is a) cell division.

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