Help? please and thank you! very much appreciated

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2