When a group of cells that are the same type work together this is an example of

Which statement best describes a typical difference that could be found between the “analysis” and “conclusion” sections of a lab report?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?