Which of these is best studied using radio waves instead of light waves? a. the sun c. a nebula made of gas and dust red giant star d. a large galaxy made of billions of stars

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

The transport tubes from food came down the plant are called?

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids