How do organs relate to cells and tissues?

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

In which state was more than 100 billion tons of coal mined in 2005?