Amiddle age star that burns hydrogen is a

a. main sequence star
b. neutron star
c. white dwarf
d. pulsar

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Which of th following best describes how genes produce traits in an organism?

What is the name of the idea that energy cannot be created nor destroyed