BTW this is actually a science quetion. What is the amount of matter in an object compared to the space it takes up. Im confused because i think its mass but i was told that mass is the amount of matter something contains.

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.