Robert hooke, a curator of instruments, improved upon galileo galilei's simple microscope to create what? a) cork b) glasses c) telescope d) compound microscope

Which technically is nasa developing that will astronauts reach mars

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

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