Why did dr Tyson deside to exclude Pluto from exhibits of planets?

What are the resulting compounds called? What is the greenhouse effect and how can you prevent it? What is the term used to describe the ability to produce a specific product more efficiently than any other nation? What are some unique characteristics of siltstone? To view live tissue which preparation would you use? What is the net movement of gases into anf out of a leaf during daytime? Is the rain a noun -? What part of the periwinkle is used for winblastine? How many GPS satellites are there and how many miles are they above the Earth? Which pair of rocks could only be composed of only one mineral.? Where does Cerebrospinal fluid enter the bloodstream? Can time of a latitude be determined by a given information about the time of a longitude? Was iceland formed from an oceanic plate collision? What are 5 things that break a rock? Has it snowed in canyon country ca? What are Mexico's physical features? Is hard candy a solution or mixture? Can the ozone be repaired? How do you prepare aloe vera at home? Do you have a sealed jar full of air if you put it in the freezer what happens to the gas pressure in the jar?