"at first, the group of investors were not impressed by young calvin's for the new advertising campaign, but by the end of the presentation, everyone was on board with the plan." a) conceivable b) conceive c) conceiving d) concept

D)concept

Explanation:

"At first, the group of investors were not impressed by young Calvin's concept for the new advertising campaign, but by the end of the presentation, everyone was on board with the plan."

In the above sentence, the only reasonable word for the blank space is concept. The other options can't make any suitable sentence in accordance with the rest of the sentence structure. They all represent either a verb or an adjective whereas the word 'concept' is a noun.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

climate change and pollution