Whales and dolphins navigating underwater with sound waves is called what?

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

We can be sure that a mole of table sugar and a mole of vitamin c are equal in their 1) mass in daltons. 2) mass in grams. 3) number of molecules. 4) number of atoms. 5) volume.

What does this experimental investigation lack